diff --git a/Assets/Resources/Fonts/Pretendard/Pretendard-Regular SDF.asset b/Assets/Resources/Fonts/Pretendard/Pretendard-Regular SDF.asset
index 5a765b54..38eef7be 100644
--- a/Assets/Resources/Fonts/Pretendard/Pretendard-Regular SDF.asset	
+++ b/Assets/Resources/Fonts/Pretendard/Pretendard-Regular SDF.asset	
@@ -12,9 +12,9 @@ Texture2D:
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   m_IsAlphaChannelOptional: 0
   serializedVersion: 4
-  m_Width: 4096
-  m_Height: 4096
-  m_CompleteImageSize: 16777216
+  m_Width: 1
+  m_Height: 1
+  m_CompleteImageSize: 1
   m_MipsStripped: 0
   m_TextureFormat: 1
   m_MipCount: 1
@@ -39,8 +39,8 @@ Texture2D:
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   m_ColorSpace: 0
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+  image data: 1
+  _typelessdata: 00
   m_StreamData:
     serializedVersion: 2
     offset: 0
diff --git a/Assets/Resources/UIToolkit/List/UTKAccordionList.uss b/Assets/Resources/UIToolkit/List/UTKAccordionList.uss
index 8f2b0cc3..e6ab32d1 100644
--- a/Assets/Resources/UIToolkit/List/UTKAccordionList.uss
+++ b/Assets/Resources/UIToolkit/List/UTKAccordionList.uss
@@ -51,22 +51,23 @@
     height: 16px;
 }
 
-/* TreeView 토글 체크마크 (펼침/접힘 아이콘) */
-.accordion-section-row #unity-checkmark {
+.accordion-tree-view .unity-tree-view__item-indent {
+    width: 0;
+    min-width: 0;
+    max-width: 0;
+    flex-basis: 0;
+    flex-grow: 0;
+    flex-shrink: 0;
+}
+
+.accordion-tree-view .unity-tree-view__item-toggle .unity-toggle__checkmark {
     width: 22px;
     height: 22px;
     background-image: resource('UIToolkit/Images/icon_right_22');
     -unity-background-image-tint-color: var(--accordion-icon-color);
-    transition-duration: 0.2s;
-    transition-property: rotate;
     rotate: 0;
 }
 
-/* 펼쳐진 상태 */
-.accordion-section-row .unity-tree-view__item-toggle:checked #unity-checkmark {
-    rotate: 90deg;
-}
-
 .accordion-tree-view {
     flex-grow: 1;
     background-color: transparent;
@@ -119,7 +120,6 @@
     display: none;
 }
 
-/* 섹션 행 전체 배경색 (토글 영역 포함) */
 .accordion-section-row {
     background-color: var(--accordion-header-bg);
 }
@@ -128,7 +128,6 @@
     background-color: var(--accordion-header-hover);
 }
 
-/* 섹션 행의 토글 표시 */
 .accordion-section-row .unity-tree-view__item-toggle {
     display: flex;
     width: 16px;
@@ -157,8 +156,7 @@
 }
 
 .accordion-section {
-    border-bottom-width: 1px;
-    border-bottom-color: var(--accordion-border-color);
+    border-bottom-width: 0;
     margin-bottom: 0;
 }
 
@@ -175,7 +173,6 @@
     background-color: transparent;
 }
 
-/* 섹션 헤더 내 펼침 버튼 숨김 (TreeView 토글 사용) */
 .accordion-expand-button {
     display: none;
 }
@@ -212,6 +209,7 @@
     height: 25px;
     padding: 0 8px 0 28px;
     background-color: transparent;
+    padding-right: 0;
 }
 
 .accordion-horizontal-item:hover {
@@ -276,7 +274,7 @@
     background-color: transparent;
     border-width: 0;
     padding: 0;
-    margin-left: 0px;
+    margin-left: 0;
     align-items: center;
     justify-content: center;
 }
@@ -297,11 +295,6 @@
     -unity-background-image-tint-color: var(--accordion-icon-hover);
 }
 
-/* ------------------------------------------------
-   그리드 아이템 (UTKImageListItem 스타일 참고)
-   ------------------------------------------------ */
-
-/* 그리드 행 컨테이너 (2개씩 배치) */
 .accordion-grid-row {
     flex-direction: row;
     justify-content: flex-start;
@@ -309,7 +302,6 @@
     padding: 0;
 }
 
-/* 그리드 아이템 */
 .accordion-grid-item {
     flex-direction: column;
     align-items: center;
@@ -341,7 +333,6 @@
     visibility: hidden;
 }
 
-/* 그리드 이미지 */
 .accordion-grid-image {
     width: 116px;
     height: 87px;
@@ -358,7 +349,6 @@
     background-image: none;
 }
 
-/* 그리드 캡션 */
 .accordion-grid-caption {
     color: var(--accordion-text-color);
     font-size: 11px;
@@ -376,7 +366,6 @@
     color: white;
 }
 
-/* 레거시 그리드 컨테이너 (하위 호환성) */
 .accordion-grid-container {
     flex-direction: row;
     flex-wrap: wrap;
diff --git a/Assets/Resources/UIToolkit/List/UTKComponentList.uss b/Assets/Resources/UIToolkit/List/UTKComponentList.uss
index 5c843555..bf6dea62 100644
--- a/Assets/Resources/UIToolkit/List/UTKComponentList.uss
+++ b/Assets/Resources/UIToolkit/List/UTKComponentList.uss
@@ -16,8 +16,25 @@
     margin-left: 0;
 }
 
-#unity-checkmark {
+/* 카테고리 확장/축소 토글 화살표 스타일 */
+.unity-tree-view__item-toggle #unity-checkmark {
     background-image: resource('UIToolkit/Images/icon_down_22');
+    transition-property: rotate;
+    transition-duration: 0.15s;
+}
+
+/* 카테고리 항목: hover 시 배경 색상 변경 없음 */
+.category-item:hover {
+    background-color: rgba(0, 0, 0, 0);
+}
+
+/* 카테고리 항목: 선택 스타일도 비활성화 */
+.category-item:checked {
+    background-color: rgba(0, 0, 0, 0);
+}
+
+.category-item:hover:checked {
+    background-color: rgba(0, 0, 0, 0);
 }
 
 .visibility-toggle {
diff --git a/Assets/Sample/UIToolkit/UTKComponentListWindowSample.cs b/Assets/Sample/UIToolkit/UTKComponentListWindowSample.cs
index 93f9244f..bbb611a1 100644
--- a/Assets/Sample/UIToolkit/UTKComponentListWindowSample.cs
+++ b/Assets/Sample/UIToolkit/UTKComponentListWindowSample.cs
@@ -13,7 +13,7 @@ public class UTKComponentListWindowSample : MonoBehaviour
     [SerializeField]
     public UIDocument uiDocument;
 
-    
+
 
     private UTKComponentListWindow listWindow;
     private UTKComponentTabListWindow tabListWindow;
@@ -22,7 +22,7 @@ public class UTKComponentListWindowSample : MonoBehaviour
     {
         uiDocument ??= GetComponent<UIDocument>();
 
-        
+
             // UTKComponentTabListWindow 사용 (탭 기능 포함)
             tabListWindow = new UTKComponentTabListWindow();
             tabListWindow.style.marginLeft = 500;
@@ -33,7 +33,7 @@ public class UTKComponentListWindowSample : MonoBehaviour
 
             // 이벤트 핸들러 등록
             RegisterTabListEventHandlers();
-        
+
             // UTKComponentListWindow 사용 (기본)
             listWindow = new UTKComponentListWindow();
             uiDocument.rootVisualElement.Add(listWindow);
@@ -43,24 +43,25 @@ public class UTKComponentListWindowSample : MonoBehaviour
 
             // 이벤트 핸들러 등록
             RegisterEventHandlers();
-        
+
     }
 
     /// <summary>
     /// 테스트용 계층적 트리 데이터를 생성합니다.
-    /// 10개의 루트 항목을 생성하고, 각 루트에 5개의 자식,
-    /// 각 자식에 3개의 손자, 각 손자에 2개의 증손자를 추가합니다.
+    /// 5개의 카테고리를 생성하고, 각 카테고리에 20개의 항목을 추가합니다.
     /// </summary>
     private void CreateTestData()
     {
-        var data = new List<UTKComponentListItemData>();
+        var data = new List<UTKComponentListItemDataBase>();
         for (int i = 1; i <= 5; i++)
         {
             string categoryName = $"Category {i}";
-            UTKComponentListItemData categoryData = new UTKComponentListItemData { name = categoryName };
-            
+            // 카테고리 데이터 생성 (UTKComponentListCategoryData 사용)
+            var categoryData = new UTKComponentListCategoryData { name = categoryName };
+
             for (int j = 1; j <= 20; j++)
             {
+                // 일반 항목 데이터 생성 (UTKComponentListItemData 사용)
                 var itemData = new UTKComponentListItemData
                 {
                     name = $"Item {i}-{j}",
@@ -72,7 +73,7 @@ public class UTKComponentListWindowSample : MonoBehaviour
         }
         listWindow.SetData(data);
 
-        Debug.Log("[UTKComponentListWindowSample] 테스트 데이터 생성 완료: 5개 루트 항목");
+        Debug.Log("[UTKComponentListWindowSample] 테스트 데이터 생성 완료: 5개 카테고리");
     }
 
     /// <summary>
@@ -83,7 +84,7 @@ public class UTKComponentListWindowSample : MonoBehaviour
     {
         // 항목 선택 이벤트 (다중 선택 지원)
         // 사용자가 항목을 클릭하거나 SelectItem() 호출 시 발생
-        listWindow.OnItemSelected += (List<UTKComponentListItemData> selectedItems) =>
+        listWindow.OnItemSelected += (List<UTKComponentListItemDataBase> selectedItems) =>
         {
             foreach (var item in selectedItems)
             {
@@ -93,7 +94,7 @@ public class UTKComponentListWindowSample : MonoBehaviour
 
         // 항목 선택 해제 이벤트 (다중 선택 지원)
         // 사용자가 다른 항목을 선택하거나 DeselectItem() 호출 시 발생
-        listWindow.OnItemDeselected += (List<UTKComponentListItemData> deselectedItems) =>
+        listWindow.OnItemDeselected += (List<UTKComponentListItemDataBase> deselectedItems) =>
         {
             foreach (var item in deselectedItems)
             {
@@ -104,7 +105,7 @@ public class UTKComponentListWindowSample : MonoBehaviour
         // 항목 삭제 이벤트
         // 사용자가 Delete 또는 Backspace 키를 누를 때 발생
         // 실제 삭제는 이 핸들러에서 DeleteItem()을 호출하여 수행
-        listWindow.OnItemDeleted += (UTKComponentListItemData deletedItem) =>
+        listWindow.OnItemDeleted += (UTKComponentListItemDataBase deletedItem) =>
         {
             Debug.Log($"[삭제 요청] {deletedItem.name}");
             // 실제로 항목을 삭제하려면 아래 주석을 해제하세요:
@@ -113,21 +114,21 @@ public class UTKComponentListWindowSample : MonoBehaviour
 
         // 항목 더블클릭 이벤트
         // 사용자가 항목을 더블클릭하거나 Enter 키를 누를 때 발생
-        listWindow.OnItemDoubleClicked += (UTKComponentListItemData doubleClickedItem) =>
+        listWindow.OnItemDoubleClicked += (UTKComponentListItemDataBase doubleClickedItem) =>
         {
             Debug.Log($"[더블클릭] {doubleClickedItem.name}");
         };
 
         // 항목 가시성 변경 이벤트
         // 사용자가 눈 아이콘 버튼을 클릭하여 가시성을 토글할 때 발생
-        listWindow.OnItemVisibilityChanged += (UTKComponentListItemData item, bool isVisible) =>
+        listWindow.OnItemVisibilityChanged += (UTKComponentListItemDataBase item, bool isVisible) =>
         {
             Debug.Log($"[가시성 변경] {item.name}, IsVisible: {isVisible}");
         };
 
         // 아이콘 클릭 이벤트
         // 그룹 항목의 setting-btn 등 아이콘 버튼 클릭 시 발생
-        listWindow.OnItemIconClicked += (string iconName, UTKComponentListItemData item) =>
+        listWindow.OnItemIconClicked += (string iconName, UTKComponentListItemDataBase item) =>
         {
             Debug.Log($"[아이콘 클릭] {iconName}, Item: {item.name}");
         };
@@ -141,14 +142,16 @@ public class UTKComponentListWindowSample : MonoBehaviour
     /// </summary>
     private void CreateTabListTestData()
     {
-        var data = new List<UTKComponentListItemData>();
+        var data = new List<UTKComponentListItemDataBase>();
         for (int i = 1; i <= 5; i++)
         {
             string categoryName = $"Category {i}";
-            UTKComponentListItemData categoryData = new UTKComponentListItemData { name = categoryName };
+            // 카테고리 데이터 생성 (UTKComponentListCategoryData 사용)
+            var categoryData = new UTKComponentListCategoryData { name = categoryName };
 
             for (int j = 1; j <= 20; j++)
             {
+                // 일반 항목 데이터 생성 (UTKComponentListItemData 사용)
                 var itemData = new UTKComponentListItemData
                 {
                     name = $"Item {i}-{j}",
@@ -169,7 +172,7 @@ public class UTKComponentListWindowSample : MonoBehaviour
     private void RegisterTabListEventHandlers()
     {
         // 항목 선택 이벤트 (다중 선택 지원)
-        tabListWindow.OnItemSelected += (List<UTKComponentListItemData> selectedItems) =>
+        tabListWindow.OnItemSelected += (List<UTKComponentListItemDataBase> selectedItems) =>
         {
             foreach (var item in selectedItems)
             {
@@ -178,7 +181,7 @@ public class UTKComponentListWindowSample : MonoBehaviour
         };
 
         // 항목 선택 해제 이벤트 (다중 선택 지원)
-        tabListWindow.OnItemDeselected += (List<UTKComponentListItemData> deselectedItems) =>
+        tabListWindow.OnItemDeselected += (List<UTKComponentListItemDataBase> deselectedItems) =>
         {
             foreach (var item in deselectedItems)
             {
@@ -187,25 +190,25 @@ public class UTKComponentListWindowSample : MonoBehaviour
         };
 
         // 항목 삭제 이벤트
-        tabListWindow.OnItemDeleted += (UTKComponentListItemData deletedItem) =>
+        tabListWindow.OnItemDeleted += (UTKComponentListItemDataBase deletedItem) =>
         {
             Debug.Log($"[TabList 삭제 요청] {deletedItem.name}");
         };
 
         // 항목 더블클릭 이벤트
-        tabListWindow.OnItemDoubleClicked += (UTKComponentListItemData doubleClickedItem) =>
+        tabListWindow.OnItemDoubleClicked += (UTKComponentListItemDataBase doubleClickedItem) =>
         {
             Debug.Log($"[TabList 더블클릭] {doubleClickedItem.name}");
         };
 
         // 항목 가시성 변경 이벤트
-        tabListWindow.OnItemVisibilityChanged += (UTKComponentListItemData item, bool isVisible) =>
+        tabListWindow.OnItemVisibilityChanged += (UTKComponentListItemDataBase item, bool isVisible) =>
         {
             Debug.Log($"[TabList 가시성 변경] {item.name}, IsVisible: {isVisible}");
         };
 
         // 아이콘 클릭 이벤트
-        tabListWindow.OnItemIconClicked += (string iconName, UTKComponentListItemData item) =>
+        tabListWindow.OnItemIconClicked += (string iconName, UTKComponentListItemDataBase item) =>
         {
             Debug.Log($"[TabList 아이콘 클릭] {iconName}, Item: {item.name}");
         };
diff --git a/Assets/Scripts/UVC/UIToolkit/List/UTKAccordionList.cs b/Assets/Scripts/UVC/UIToolkit/List/UTKAccordionList.cs
index ce4becd8..fcac0028 100644
--- a/Assets/Scripts/UVC/UIToolkit/List/UTKAccordionList.cs
+++ b/Assets/Scripts/UVC/UIToolkit/List/UTKAccordionList.cs
@@ -534,8 +534,17 @@ namespace UVC.UIToolkit.List
             // 이전 바인딩에서 추가된 클래스 제거
             treeViewItem?.RemoveFromClassList("accordion-section-row");
 
+            // 들여쓰기 요소 너비 강제 제거
+            var indentElement = treeViewItem?.Q<VisualElement>("unity-tree-view__item-indent");
+            if (indentElement != null)
+            {
+                indentElement.style.width = 0;
+            }
+
             // 토글(화살표) 영역 설정
             var toggle = treeViewItem?.Q<Toggle>("unity-tree-view__item-toggle");
+            var checkmark = toggle?.Q<VisualElement>("unity-checkmark");
+
             if (toggle != null)
             {
                 // 섹션만 화살표 표시
@@ -544,10 +553,36 @@ namespace UVC.UIToolkit.List
                 toggle.style.display = hasChildren ? DisplayStyle.Flex : DisplayStyle.None;
             }
 
-            // 섹션 행에 배경색 클래스 추가
+            // 섹션 행에 배경색 클래스 추가 및 회전 상태 설정
             if (item.nodeType == UTKAccordionNodeType.Section && treeViewItem != null)
             {
                 treeViewItem.AddToClassList("accordion-section-row");
+
+                // 섹션의 확장 상태에 따라 회전 직접 설정 (transition 없이 즉시 적용)
+                if (checkmark != null)
+                {
+                    // transition 비활성화 후 회전 설정
+                    checkmark.style.transitionDuration = new List<TimeValue> { new TimeValue(0f) };
+                    float angle = item.isExpanded ? 90f : 0f;
+                    checkmark.style.rotate = new Rotate(angle);
+
+                    // 다음 프레임에 transition 복원
+                    checkmark.schedule.Execute(() =>
+                    {
+                        checkmark.style.transitionDuration = new List<TimeValue> { new TimeValue(0.2f, TimeUnit.Second) };
+                        checkmark.style.transitionProperty = new List<StylePropertyName> { new StylePropertyName("rotate") };
+                    });
+                }
+            }
+            else
+            {
+                // 섹션이 아닌 경우 회전 및 transition 제거
+                if (checkmark != null)
+                {
+                    checkmark.style.rotate = StyleKeyword.Null;
+                    checkmark.style.transitionDuration = StyleKeyword.Null;
+                    checkmark.style.transitionProperty = StyleKeyword.Null;
+                }
             }
 
             // 노드 타입에 따라 UI 생성
@@ -576,6 +611,18 @@ namespace UVC.UIToolkit.List
 
         private void UnbindTreeItem(VisualElement element, int index)
         {
+            // TreeView 행 요소에서 섹션 클래스 제거 (가상화 시 재사용 대비)
+            var treeViewItem = element.parent?.parent;
+            treeViewItem?.RemoveFromClassList("accordion-section-row");
+
+            // 토글 체크마크 회전 상태 초기화
+            var toggle = treeViewItem?.Q<Toggle>("unity-tree-view__item-toggle");
+            var checkmark = toggle?.Q<VisualElement>("unity-checkmark");
+            if (checkmark != null)
+            {
+                checkmark.style.rotate = StyleKeyword.Null;
+            }
+
             // 이벤트 정리 등 필요한 작업
             element.userData = null;
         }
@@ -926,6 +973,9 @@ namespace UVC.UIToolkit.List
             {
                 item.isExpanded = evt.isExpanded;
 
+                // 해당 아이템의 회전 상태 업데이트
+                UpdateItemRotation(evt.id, evt.isExpanded);
+
                 if (item.IsSection)
                 {
                     var legacySection = new UTKAccordionSectionData
@@ -939,6 +989,35 @@ namespace UVC.UIToolkit.List
             }
         }
 
+        /// <summary>특정 아이템의 회전 상태를 업데이트합니다.</summary>
+        private void UpdateItemRotation(int itemId, bool isExpanded)
+        {
+            if (_treeView == null) return;
+
+            // TreeView에서 해당 아이템의 index 찾기
+            var index = _treeView.viewController.GetIndexForId(itemId);
+            if (index < 0) return;
+
+            // 해당 index의 VisualElement 찾기
+            var itemElement = _treeView.Q<VisualElement>($"unity-tree-view__item");
+
+            // TreeView 내의 모든 행을 순회하여 해당 아이템 찾기
+            _treeView.Query<VisualElement>(className: "unity-tree-view__item").ForEach(treeViewItem =>
+            {
+                var container = treeViewItem.Q<VisualElement>("accordion-item-container");
+                if (container?.userData is UTKAccordionItemData data && data.id == itemId)
+                {
+                    var toggle = treeViewItem.Q<Toggle>("unity-tree-view__item-toggle");
+                    var checkmark = toggle?.Q<VisualElement>("unity-checkmark");
+                    if (checkmark != null)
+                    {
+                        float angle = isExpanded ? 90f : 0f;
+                        checkmark.style.rotate = new Rotate(angle);
+                    }
+                }
+            });
+        }
+
         private void ExpandByData(List<UTKAccordionItemData> items)
         {
             if (_treeView == null || items == null) return;
diff --git a/Assets/Scripts/UVC/UIToolkit/List/UTKComponentList.cs b/Assets/Scripts/UVC/UIToolkit/List/UTKComponentList.cs
index 5b617dab..e7c2a18c 100644
--- a/Assets/Scripts/UVC/UIToolkit/List/UTKComponentList.cs
+++ b/Assets/Scripts/UVC/UIToolkit/List/UTKComponentList.cs
@@ -95,13 +95,13 @@ namespace UVC.UIToolkit.List
         /// 원본 루트 데이터입니다.
         /// 검색 필터 해제 시 원래 데이터로 복원하는 데 사용됩니다.
         /// </summary>
-        private List<UTKComponentListItemData> _originalRoots = new();
+        private List<UTKComponentListItemDataBase> _originalRoots = new();
 
         /// <summary>
         /// TreeView에 바인딩되는 데이터 소스입니다.
         /// TreeViewItemData는 Unity의 TreeView가 요구하는 래퍼 타입입니다.
         /// </summary>
-        private List<TreeViewItemData<UTKComponentListItemData>>? _rootData;
+        private List<TreeViewItemData<UTKComponentListItemDataBase>>? _rootData;
 
         /// <summary>
         /// 항목 ID 자동 생성을 위한 시드 값입니다.
@@ -113,7 +113,7 @@ namespace UVC.UIToolkit.List
         /// 이전에 선택된 항목들입니다.
         /// 선택 해제 이벤트 발송에 사용됩니다.
         /// </summary>
-        private List<UTKComponentListItemData> _previouslySelectedItems = new();
+        private List<UTKComponentListItemDataBase> _previouslySelectedItems = new();
 
         /// <summary>
         /// 선택 이벤트 발송을 일시적으로 억제하는 플래그입니다.
@@ -152,32 +152,32 @@ namespace UVC.UIToolkit.List
         /// <summary>
         /// 메인/검색 리스트에서 항목이 선택될 때 발생합니다.
         /// </summary>
-        public Action<List<UTKComponentListItemData>>? OnItemSelected;
+        public Action<List<UTKComponentListItemDataBase>>? OnItemSelected;
 
         /// <summary>
         /// 메인/검색 리스트에서 항목이 선택 해제될 때 발생합니다.
         /// </summary>
-        public Action<List<UTKComponentListItemData>>? OnItemDeselected;
+        public Action<List<UTKComponentListItemDataBase>>? OnItemDeselected;
         /// <summary>
         /// 항목의 가시성(눈 아이콘)이 변경될 때 발생합니다.
         /// 3D 모델의 GameObject 활성화/비활성화에 연동합니다.
         /// </summary>
-        public event Action<UTKComponentListItemData, bool>? OnItemVisibilityChanged;
+        public event Action<UTKComponentListItemDataBase, bool>? OnItemVisibilityChanged;
 
         /// <summary>
         /// 메인/검색 리스트에서 항목이 삭제될 때 발생합니다 (Delete 키).
         /// </summary>
-        public Action<UTKComponentListItemData>? OnItemDeleted;
+        public Action<UTKComponentListItemDataBase>? OnItemDeleted;
 
         /// <summary>
         /// 메인/검색 리스트에서 항목이 더블클릭될 때 발생합니다.
         /// </summary>
-        public Action<UTKComponentListItemData>? OnItemDoubleClicked;
+        public Action<UTKComponentListItemDataBase>? OnItemDoubleClicked;
 
         /// <summary>
         /// 아이콘을 클릭할 때 발생합니다.
         /// </summary>
-        public Action<string, UTKComponentListItemData>? OnItemIconClicked;
+        public Action<string, UTKComponentListItemDataBase>? OnItemIconClicked;
 
         #endregion
 
@@ -405,25 +405,25 @@ namespace UVC.UIToolkit.List
 
         /// <summary>
         /// 트리 데이터를 설정합니다.
-        /// UTKComponentListItemData 리스트를 받아 TreeView에 바인딩합니다.
+        /// UTKComponentListItemDataBase 리스트를 받아 TreeView에 바인딩합니다.
         /// </summary>
         /// <param name="roots">루트 항목들의 리스트 (계층 구조의 최상위 항목들)</param>
-        public void SetData(List<UTKComponentListItemData> roots)
+        public void SetData(List<UTKComponentListItemDataBase> roots)
         {
             // 원본 데이터 저장 (필터 복원용)
-            _originalRoots = roots ?? new List<UTKComponentListItemData>();
+            _originalRoots = roots ?? new List<UTKComponentListItemDataBase>();
 
             // ID 시드 초기화
             _idSeed = 1;
 
             // 순환 참조 감지를 위한 방문 집합
-            var visited = new HashSet<UTKComponentListItemData>();
+            var visited = new HashSet<UTKComponentListItemDataBase>();
 
             // TreeView 형식으로 데이터 변환
             _rootData = ConvertToTreeViewData(_originalRoots, visited, 0);
 
             // TreeView에 데이터 설정
-            _treeView!.SetRootItems<UTKComponentListItemData>(_rootData);
+            _treeView!.SetRootItems<UTKComponentListItemDataBase>(_rootData);
 
             // UI 갱신 및 데이터의 isExpanded 상태에 따라 펼치기
             _treeView!.Rebuild();
@@ -434,7 +434,7 @@ namespace UVC.UIToolkit.List
         /// 데이터의 isExpanded 값에 따라 항목을 펼치거나 접습니다.
         /// </summary>
         /// <param name="items">처리할 항목 리스트</param>
-        private void ExpandByData(List<UTKComponentListItemData> items)
+        private void ExpandByData(List<UTKComponentListItemDataBase> items)
         {
             if (_treeView == null || items == null) return;
 
@@ -455,7 +455,7 @@ namespace UVC.UIToolkit.List
         /// <summary>
         /// ExpandByData의 내부 재귀 구현입니다.
         /// </summary>
-        private void ExpandByDataInternal(List<UTKComponentListItemData> items)
+        private void ExpandByDataInternal(List<UTKComponentListItemDataBase> items)
         {
             foreach (var item in items)
             {
@@ -510,7 +510,7 @@ namespace UVC.UIToolkit.List
         /// ID가 0이면 자동으로 할당됩니다.
         /// </summary>
         /// <param name="data">추가할 항목 데이터</param>
-        public void AddItem(UTKComponentListItemData data)
+        public void AddItem(UTKComponentListItemDataBase data)
         {
             if (data == null) return;
 
@@ -521,13 +521,13 @@ namespace UVC.UIToolkit.List
             _originalRoots.Add(data);
 
             // _rootData가 null이면 초기화
-            _rootData ??= new List<TreeViewItemData<UTKComponentListItemData>>();
+            _rootData ??= new List<TreeViewItemData<UTKComponentListItemDataBase>>();
 
             // TreeViewItemData 래퍼 생성 및 추가
             var childData = data.children != null && data.children.Count > 0
-                ? ConvertToTreeViewData(data.children, new HashSet<UTKComponentListItemData>(), 1)
+                ? ConvertToTreeViewData(data.children, new HashSet<UTKComponentListItemDataBase>(), 1)
                 : null;
-            var treeItem = new TreeViewItemData<UTKComponentListItemData>(data.id, data, childData);
+            var treeItem = new TreeViewItemData<UTKComponentListItemDataBase>(data.id, data, childData);
             _rootData.Add(treeItem);
 
             // TreeView 갱신
@@ -537,11 +537,11 @@ namespace UVC.UIToolkit.List
         }
 
         /// <summary>
-        /// 지정된 부모 항목의 자식으로 새 항목을 추가합니다.
+        /// 지정된 부모 카테고리의 자식으로 새 항목을 추가합니다.
         /// </summary>
-        /// <param name="parent">부모 항목 (null이면 루트에 추가)</param>
+        /// <param name="parent">부모 카테고리 (null이면 루트에 추가)</param>
         /// <param name="data">추가할 항목 데이터</param>
-        public void AddItem(UTKComponentListItemData? parent, UTKComponentListItemData data)
+        public void AddItem(UTKComponentListCategoryData? parent, UTKComponentListItemDataBase data)
         {
             if (data == null) return;
 
@@ -556,8 +556,7 @@ namespace UVC.UIToolkit.List
             if (data.id == 0) data.id = _idSeed++;
 
             // 부모의 children 리스트에 추가
-            parent.children ??= new List<UTKComponentListItemData>();
-            parent.children.Add(data);
+            parent.Add(data);
 
             // TreeView 데이터 재구성 및 갱신
             RefreshTreeViewData();
@@ -568,7 +567,7 @@ namespace UVC.UIToolkit.List
         /// 자식 항목이 있는 경우 함께 삭제됩니다.
         /// </summary>
         /// <param name="data">삭제할 항목 데이터</param>
-        public void DeleteItem(UTKComponentListItemData data)
+        public void DeleteItem(UTKComponentListItemDataBase data)
         {
             if (data == null) return;
 
@@ -607,7 +606,7 @@ namespace UVC.UIToolkit.List
         /// </summary>
         /// <param name="data">변경할 항목 데이터</param>
         /// <param name="newName">새 이름</param>
-        public void SetItemName(UTKComponentListItemData data, string newName)
+        public void SetItemName(UTKComponentListItemDataBase data, string newName)
         {
             if (data == null || string.IsNullOrEmpty(newName)) return;
 
@@ -734,7 +733,7 @@ namespace UVC.UIToolkit.List
         /// </summary>
         private void RefreshTreeViewData()
         {
-            var visited = new HashSet<UTKComponentListItemData>();
+            var visited = new HashSet<UTKComponentListItemDataBase>();
             _rootData = ConvertToTreeViewData(_originalRoots, visited, 0);
             _treeView?.SetRootItems(_rootData);
             _treeView?.Rebuild();
@@ -747,14 +746,18 @@ namespace UVC.UIToolkit.List
         /// <param name="parent">부모 노드</param>
         /// <param name="target">삭제할 대상 항목</param>
         /// <returns>삭제 성공 여부</returns>
-        private bool RemoveFromChildren(UTKComponentListItemData parent, UTKComponentListItemData target)
+        private bool RemoveFromChildren(UTKComponentListItemDataBase parent, UTKComponentListItemDataBase target)
         {
             if (parent.children == null || parent.children.Count == 0) return false;
 
-            // 직접 자식에서 삭제 시도
-            if (parent.children.Remove(target))
+            // 카테고리인 경우에만 자식에서 삭제 가능
+            if (parent is UTKComponentListCategoryData category)
             {
-                return true;
+                // 직접 자식에서 삭제 시도
+                if (category.Remove(target))
+                {
+                    return true;
+                }
             }
 
             // 하위 자식들에서 재귀적으로 검색
@@ -774,7 +777,7 @@ namespace UVC.UIToolkit.List
         /// </summary>
         /// <param name="name">찾을 항목의 이름</param>
         /// <returns>찾은 항목 또는 null</returns>
-        private UTKComponentListItemData? FindItemByName(string name)
+        private UTKComponentListItemDataBase? FindItemByName(string name)
         {
             foreach (var root in _originalRoots)
             {
@@ -789,7 +792,7 @@ namespace UVC.UIToolkit.List
         /// _previouslySelectedItems와 TreeView의 선택 상태 모두에서 제거합니다.
         /// </summary>
         /// <param name="data">삭제된 항목</param>
-        private void RemoveFromSelection(UTKComponentListItemData data)
+        private void RemoveFromSelection(UTKComponentListItemDataBase data)
         {
             // 삭제할 항목과 모든 자식들의 ID 수집
             var idsToRemove = new HashSet<int>();
@@ -806,7 +809,7 @@ namespace UVC.UIToolkit.List
 
                 foreach (var index in currentSelection)
                 {
-                    var selectedItem = _treeView.GetItemDataForIndex<UTKComponentListItemData>(index);
+                    var selectedItem = _treeView.GetItemDataForIndex<UTKComponentListItemDataBase>(index);
                     if (selectedItem != null && !idsToRemove.Contains(selectedItem.id))
                     {
                         newSelection.Add(selectedItem.id);
@@ -825,7 +828,7 @@ namespace UVC.UIToolkit.List
         /// </summary>
         /// <param name="node">수집 시작 노드</param>
         /// <param name="ids">ID를 저장할 HashSet</param>
-        private void CollectItemIds(UTKComponentListItemData node, HashSet<int> ids)
+        private void CollectItemIds(UTKComponentListItemDataBase node, HashSet<int> ids)
         {
             ids.Add(node.id);
 
@@ -844,7 +847,7 @@ namespace UVC.UIToolkit.List
         /// <param name="node">검색 시작 노드</param>
         /// <param name="name">찾을 항목의 이름</param>
         /// <returns>찾은 항목 또는 null</returns>
-        private UTKComponentListItemData? FindItemByNameRecursive(UTKComponentListItemData node, string name)
+        private UTKComponentListItemDataBase? FindItemByNameRecursive(UTKComponentListItemDataBase node, string name)
         {
             if (node.name == name) return node;
 
@@ -867,7 +870,7 @@ namespace UVC.UIToolkit.List
         /// <param name="visibleNames">표시할 이름 목록</param>
         /// <param name="maxDepth">최대 검색 깊이 (0이하=무제한)</param>
         /// <param name="currentDepth">현재 깊이</param>
-        private void SetVisibilityByNames(UTKComponentListItemData node, HashSet<string> visibleNames, int maxDepth, int currentDepth)
+        private void SetVisibilityByNames(UTKComponentListItemDataBase node, HashSet<string> visibleNames, int maxDepth, int currentDepth)
         {
             if (node == null) return;
 
@@ -908,8 +911,31 @@ namespace UVC.UIToolkit.List
             // SelectionType.None인 경우 선택 변경 무시
             if (_treeView?.selectionType == SelectionType.None) return;
 
-            // 현재 선택된 항목들 (TreeView가 selectionType에 따라 이미 필터링함)
-            var currentItems = selectedItems.OfType<UTKComponentListItemData>().ToList();
+            // 카테고리가 선택되었는지 확인
+            var allSelectedItems = selectedItems.OfType<UTKComponentListItemDataBase>().ToList();
+            var categorySelected = allSelectedItems.Any(item => item.IsCategory);
+
+            // 카테고리가 선택된 경우: 기존 선택 상태 유지
+            if (categorySelected)
+            {
+                // 기존 선택 상태로 복원
+                _suppressSelectionEvent = true;
+                try
+                {
+                    var previousIds = _previouslySelectedItems.Select(item => item.id).ToList();
+                    _treeView?.SetSelection(previousIds);
+                }
+                finally
+                {
+                    _suppressSelectionEvent = false;
+                }
+                return; // 이벤트 발송하지 않고 종료
+            }
+
+            // 현재 선택된 항목들 (카테고리 제외)
+            var currentItems = allSelectedItems
+                .Where(item => !item.IsCategory)
+                .ToList();
 
             // 선택 해제된 항목들 찾기 (이전에는 있었지만 현재는 없는 항목)
             var deselectedItems = _previouslySelectedItems
@@ -957,7 +983,7 @@ namespace UVC.UIToolkit.List
         /// <param name="chosenItems">선택된 항목들</param>
         private void OnTreeViewItemsChosen(IEnumerable<object> chosenItems)
         {
-            var item = chosenItems.FirstOrDefault() as UTKComponentListItemData;
+            var item = chosenItems.FirstOrDefault() as UTKComponentListItemDataBase;
             if (item != null)
             {
                 OnItemDoubleClicked?.Invoke(item);
@@ -998,26 +1024,55 @@ namespace UVC.UIToolkit.List
             // ExpandByData() 실행 중에는 이벤트 무시 (데이터 덮어쓰기 방지)
             if (_suppressExpandEvent) return;
 
-            var item = _treeView?.GetItemDataForId<UTKComponentListItemData>(evt.id);
+            var item = _treeView?.GetItemDataForId<UTKComponentListItemDataBase>(evt.id);
             if (item != null)
             {
                 item.isExpanded = evt.isExpanded;
             }
+
+            // 해당 항목의 화살표 회전 업데이트
+            UpdateToggleRotation(evt.id, evt.isExpanded);
+        }
+
+        /// <summary>
+        /// 특정 항목의 토글 화살표 회전을 업데이트합니다.
+        /// </summary>
+        /// <param name="itemId">항목 ID</param>
+        /// <param name="isExpanded">확장 상태</param>
+        private void UpdateToggleRotation(int itemId, bool isExpanded)
+        {
+            if (_treeView == null) return;
+
+            // TreeView에서 해당 항목의 인덱스 찾기
+            int index = _treeView.viewController.GetIndexForId(itemId);
+            if (index < 0) return;
+
+            // 해당 인덱스의 VisualElement 찾기
+            var itemElement = _treeView.GetRootElementForIndex(index);
+            if (itemElement == null) return;
+
+            // 토글과 체크마크 찾기
+            var toggle = itemElement.Q<Toggle>("unity-tree-view__item-toggle");
+            var checkmark = toggle?.Q<VisualElement>("unity-checkmark");
+            if (checkmark != null)
+            {
+                checkmark.style.rotate = new Rotate(isExpanded ? 0f : -90f);
+            }
         }
         #endregion
 
         #region 데이터 변환 (Data Conversion)
         /// <summary>
-        /// UTKComponentListItemData 리스트를 TreeView가 요구하는 TreeViewItemData 형식으로 변환합니다.
+        /// UTKComponentListItemDataBase 리스트를 TreeView가 요구하는 TreeViewItemData 형식으로 변환합니다.
         /// 재귀적으로 자식 항목도 변환하며, 순환 참조를 감지합니다.
         /// </summary>
         /// <param name="items">변환할 항목 리스트</param>
         /// <param name="visited">순환 참조 감지용 방문 집합</param>
         /// <param name="depth">현재 깊이 (디버깅용)</param>
         /// <returns>TreeViewItemData 래퍼 리스트</returns>
-        private List<TreeViewItemData<UTKComponentListItemData>> ConvertToTreeViewData(List<UTKComponentListItemData> items, HashSet<UTKComponentListItemData> visited, int depth)
+        private List<TreeViewItemData<UTKComponentListItemDataBase>> ConvertToTreeViewData(List<UTKComponentListItemDataBase> items, HashSet<UTKComponentListItemDataBase> visited, int depth)
         {
-            var list = new List<TreeViewItemData<UTKComponentListItemData>>(items.Count);
+            var list = new List<TreeViewItemData<UTKComponentListItemDataBase>>(items.Count);
             foreach (var item in items)
             {
                 if (item == null) continue;
@@ -1026,19 +1081,23 @@ namespace UVC.UIToolkit.List
                 if (!visited.Add(item))
                 {
                     Debug.LogWarning($"[UTKComponentList] Cycle detected at item '{item.name}' → children 무시");
-                    item.children = null;
+                    // 카테고리인 경우 자식 클리어
+                    if (item is UTKComponentListCategoryData category)
+                    {
+                        category.Clear();
+                    }
                 }
 
                 // ID가 없으면 자동 할당
                 if (item.id == 0) item.id = _idSeed++;
 
                 // 자식 항목 재귀 변환
-                List<TreeViewItemData<UTKComponentListItemData>>? childData = null;
+                List<TreeViewItemData<UTKComponentListItemDataBase>>? childData = null;
                 if (item.children != null && item.children.Count > 0)
                     childData = ConvertToTreeViewData(item.children, visited, depth + 1);
 
                 // TreeViewItemData 래퍼 생성
-                var treeItem = new TreeViewItemData<UTKComponentListItemData>(item.id, item, childData);
+                var treeItem = new TreeViewItemData<UTKComponentListItemDataBase>(item.id, item, childData);
                 list.Add(treeItem);
             }
             return list;
@@ -1072,19 +1131,81 @@ namespace UVC.UIToolkit.List
         private void BindTreeItem(VisualElement element, int index)
         {
             // 인덱스로 데이터 획득
-            var item = _treeView!.GetItemDataForIndex<UTKComponentListItemData>(index);
+            var item = _treeView!.GetItemDataForIndex<UTKComponentListItemDataBase>(index);
             if (item == null) return;
 
             // 자식 유무 확인: 실제 자식이 있거나, 검색 결과 그룹인 경우 (TreeViewItemData에만 자식이 있음)
             bool hasChildren = (item.children != null && item.children.Count > 0) || item.isSearchResultGroup;
 
-            // 0. 자식이 없는 항목의 토글(화살표) 영역 너비 제거
+            // 0. 자식이 없는 항목의 토글(화살표) 영역 너비 제거 및 회전 설정
             // element는 TemplateContainer이고, Toggle은 부모(unity-tree-view__item)의 자식
             var treeViewItem = element.parent?.parent;
             var toggle = treeViewItem?.Q<Toggle>("unity-tree-view__item-toggle");
             if (toggle != null)
             {
                 toggle.style.width = hasChildren ? StyleKeyword.Auto : 0;
+
+                // 확장 상태에 따라 화살표 회전 설정
+                if (hasChildren)
+                {
+                    var checkmark = toggle.Q<VisualElement>("unity-checkmark");
+                    if (checkmark != null)
+                    {
+                        bool isExpanded = _treeView!.IsExpanded(item.id);
+                        checkmark.style.rotate = new Rotate(isExpanded ? 0f : -90f);
+                    }
+                }
+            }
+
+            // 카테고리 항목인 경우: 선택 클릭 이벤트 차단 (Shift/Ctrl 클릭 포함)
+            // treeViewItem 레벨에서 PointerDownEvent를 캡처하여 선택 로직 차단
+            if (item.IsCategory && treeViewItem != null)
+            {
+                // 카테고리 항목에 클래스 추가 (hover 스타일 비활성화용)
+                treeViewItem.AddToClassList("category-item");
+
+                // 기존 핸들러 제거를 위해 userData 사용
+                if (treeViewItem.userData is EventCallback<PointerDownEvent> oldHandler)
+                {
+                    treeViewItem.UnregisterCallback(oldHandler, TrickleDown.TrickleDown);
+                }
+
+                EventCallback<PointerDownEvent> categoryClickHandler = (evt) =>
+                {
+                    // 토글(화살표) 영역 클릭은 허용 (펼치기/접기 기능 유지)
+                    if (toggle != null && toggle.worldBound.Contains(evt.position))
+                    {
+                        return; // 토글 클릭은 통과
+                    }
+
+                    // 카테고리 클릭 시 이벤트 전파 완전 차단
+                    // 이렇게 하면 TreeView의 선택 로직이 실행되지 않음
+                    evt.StopImmediatePropagation();
+
+                    // 펼치기/접기 토글 (카테고리 본문 클릭 시)
+                    if (_treeView != null)
+                    {
+                        bool isExpanded = _treeView.IsExpanded(item.id);
+                        if (isExpanded)
+                            _treeView.CollapseItem(item.id);
+                        else
+                            _treeView.ExpandItem(item.id);
+                    }
+                };
+
+                treeViewItem.userData = categoryClickHandler;
+                treeViewItem.RegisterCallback(categoryClickHandler, TrickleDown.TrickleDown);
+            }
+            else if (treeViewItem != null)
+            {
+                // 일반 항목인 경우: 카테고리 클래스 제거 및 이전에 등록된 핸들러 제거
+                treeViewItem.RemoveFromClassList("category-item");
+
+                if (treeViewItem.userData is EventCallback<PointerDownEvent> oldHandler)
+                {
+                    treeViewItem.UnregisterCallback(oldHandler, TrickleDown.TrickleDown);
+                    treeViewItem.userData = null;
+                }
             }
 
             // 1. 기존 내용 제거 후 적절한 템플릿으로 교체
@@ -1194,7 +1315,7 @@ namespace UVC.UIToolkit.List
         /// </summary>
         /// <param name="node">현재 노드</param>
         /// <param name="isVisible">설정할 가시성 상태</param>
-        private void SetChildrenVisibility(UTKComponentListItemData node, bool isVisible)
+        private void SetChildrenVisibility(UTKComponentListItemDataBase node, bool isVisible)
         {
             if (node.children == null || node.children.Count == 0) return;
             foreach (var child in node.children)
@@ -1266,7 +1387,7 @@ namespace UVC.UIToolkit.List
             // 검색어가 없으면 원본 데이터 복원
             if (string.IsNullOrEmpty(query))
             {
-                _treeView.SetRootItems<UTKComponentListItemData>(_rootData);
+                _treeView.SetRootItems<UTKComponentListItemDataBase>(_rootData);
                 _treeView.Rebuild();
                 ExpandByData(_originalRoots);
                 return;
@@ -1277,7 +1398,7 @@ namespace UVC.UIToolkit.List
             var filteredWrappers = FilterTree(qLower);
 
             // 필터링된 결과로 TreeView 갱신
-            _treeView.SetRootItems<UTKComponentListItemData>(filteredWrappers);
+            _treeView.SetRootItems<UTKComponentListItemDataBase>(filteredWrappers);
             _treeView.Rebuild();
 
             // 검색 결과 모두 펼치기
@@ -1289,16 +1410,16 @@ namespace UVC.UIToolkit.List
         /// </summary>
         /// <param name="qLower">소문자로 변환된 검색어</param>
         /// <returns>필터링된 TreeViewItemData 리스트 (검색 결과 그룹 포함)</returns>
-        private List<TreeViewItemData<UTKComponentListItemData>> FilterTree(string qLower)
+        private List<TreeViewItemData<UTKComponentListItemDataBase>> FilterTree(string qLower)
         {
             // 1. 매칭되는 리프 노드들만 수집
-            var matchedItems = new List<UTKComponentListItemData>();
+            var matchedItems = new List<UTKComponentListItemDataBase>();
             CollectMatchingLeafNodes(_originalRoots, qLower, matchedItems);
 
             // 2. 검색 결과가 없으면 빈 리스트 반환
             if (matchedItems.Count == 0)
             {
-                return new List<TreeViewItemData<UTKComponentListItemData>>();
+                return new List<TreeViewItemData<UTKComponentListItemDataBase>>();
             }
 
             string localeName = LocalizationManager.Instance.GetString("search_result_count");
@@ -1308,8 +1429,8 @@ namespace UVC.UIToolkit.List
             }
             localeName = localeName.Replace("{0}", matchedItems.Count.ToString());
 
-            // 3. "검색결과 N건" 그룹 데이터 생성
-            var searchResultGroup = new UTKComponentListItemData
+            // 3. "검색결과 N건" 그룹 데이터 생성 (카테고리로 생성)
+            var searchResultGroup = new UTKComponentListCategoryData
             {
                 id = -1000, // 특별한 ID (충돌 방지)
                 name = localeName,
@@ -1318,20 +1439,20 @@ namespace UVC.UIToolkit.List
             };
 
             // 4. 매칭된 항목들을 자식으로 래핑 (TreeViewItemData 형태로)
-            var childWrappers = new List<TreeViewItemData<UTKComponentListItemData>>();
+            var childWrappers = new List<TreeViewItemData<UTKComponentListItemDataBase>>();
             foreach (var item in matchedItems)
             {
-                childWrappers.Add(new TreeViewItemData<UTKComponentListItemData>(item.id, item));
+                childWrappers.Add(new TreeViewItemData<UTKComponentListItemDataBase>(item.id, item));
             }
 
             // 5. 그룹을 TreeViewItemData로 래핑
-            var groupWrapper = new TreeViewItemData<UTKComponentListItemData>(
+            var groupWrapper = new TreeViewItemData<UTKComponentListItemDataBase>(
                 searchResultGroup.id,
                 searchResultGroup,
                 childWrappers
             );
 
-            return new List<TreeViewItemData<UTKComponentListItemData>> { groupWrapper };
+            return new List<TreeViewItemData<UTKComponentListItemDataBase>> { groupWrapper };
         }
 
         /// <summary>
@@ -1340,7 +1461,7 @@ namespace UVC.UIToolkit.List
         /// <param name="items">검색할 항목 리스트</param>
         /// <param name="qLower">소문자로 변환된 검색어</param>
         /// <param name="result">매칭된 항목을 저장할 리스트</param>
-        private void CollectMatchingLeafNodes(List<UTKComponentListItemData> items, string qLower, List<UTKComponentListItemData> result)
+        private void CollectMatchingLeafNodes(List<UTKComponentListItemDataBase> items, string qLower, List<UTKComponentListItemDataBase> result)
         {
             foreach (var item in items)
             {
@@ -1367,21 +1488,21 @@ namespace UVC.UIToolkit.List
         /// <param name="node">필터링할 노드</param>
         /// <param name="qLower">소문자로 변환된 검색어</param>
         /// <returns>매치된 경우 TreeViewItemData, 아니면 null</returns>
-        private TreeViewItemData<UTKComponentListItemData>? FilterNode(UTKComponentListItemData node, string qLower)
+        private TreeViewItemData<UTKComponentListItemDataBase>? FilterNode(UTKComponentListItemDataBase node, string qLower)
         {
             // 자기 자신이 매치되는지 확인
             bool selfMatch = NodeMatches(node, qLower);
-            List<TreeViewItemData<UTKComponentListItemData>>? childFiltered = null;
+            List<TreeViewItemData<UTKComponentListItemDataBase>>? childFiltered = null;
 
             // 자식들도 재귀적으로 필터링
             if (node.children != null && node.children.Count > 0)
             {
                 foreach (var child in node.children)
                 {
-                    TreeViewItemData<UTKComponentListItemData>? f = FilterNode(child, qLower);
+                    TreeViewItemData<UTKComponentListItemDataBase>? f = FilterNode(child, qLower);
                     if (f != null)
                     {
-                        childFiltered ??= new List<TreeViewItemData<UTKComponentListItemData>>();
+                        childFiltered ??= new List<TreeViewItemData<UTKComponentListItemDataBase>>();
                         childFiltered.Add(f.Value);
                     }
                 }
@@ -1390,7 +1511,7 @@ namespace UVC.UIToolkit.List
             // 자신이 매치되거나 매치된 자식이 있으면 포함
             if (selfMatch || (childFiltered != null && childFiltered.Count > 0))
             {
-                return new TreeViewItemData<UTKComponentListItemData>(node.id, node, childFiltered);
+                return new TreeViewItemData<UTKComponentListItemDataBase>(node.id, node, childFiltered);
             }
             return null;
         }
@@ -1402,11 +1523,16 @@ namespace UVC.UIToolkit.List
         /// <param name="item">검사할 항목</param>
         /// <param name="qLower">소문자로 변환된 검색어</param>
         /// <returns>매치 여부</returns>
-        private bool NodeMatches(UTKComponentListItemData item, string qLower)
+        private bool NodeMatches(UTKComponentListItemDataBase item, string qLower)
         {
             if (item.name != null && item.name.ToLowerInvariant().Contains(qLower)) return true;
-            if (!string.IsNullOrEmpty(item.option) && item.option.ToLowerInvariant().Contains(qLower)) return true;
-            if (!string.IsNullOrEmpty(item.ExternalKey) && item.ExternalKey.ToLowerInvariant().Contains(qLower)) return true;
+
+            // 일반 항목인 경우 option과 ExternalKey도 검색
+            if (item is UTKComponentListItemData itemData)
+            {
+                if (!string.IsNullOrEmpty(itemData.option) && itemData.option.ToLowerInvariant().Contains(qLower)) return true;
+                if (!string.IsNullOrEmpty(itemData.ExternalKey) && itemData.ExternalKey.ToLowerInvariant().Contains(qLower)) return true;
+            }
             return false;
         }
 
@@ -1414,7 +1540,7 @@ namespace UVC.UIToolkit.List
         /// 필터링된 결과의 모든 항목을 펼칩니다.
         /// </summary>
         /// <param name="roots">펼칠 루트 항목들</param>
-        private void ExpandAll(List<TreeViewItemData<UTKComponentListItemData>> roots)
+        private void ExpandAll(List<TreeViewItemData<UTKComponentListItemDataBase>> roots)
         {
             foreach (var r in roots)
                 ExpandRecursive(r);
@@ -1424,7 +1550,7 @@ namespace UVC.UIToolkit.List
         /// 노드와 그 자식들을 재귀적으로 펼칩니다.
         /// </summary>
         /// <param name="wrapper">펼칠 TreeViewItemData</param>
-        private void ExpandRecursive(TreeViewItemData<UTKComponentListItemData> wrapper)
+        private void ExpandRecursive(TreeViewItemData<UTKComponentListItemDataBase> wrapper)
         {
             _treeView.ExpandItem(wrapper.id);
             if (wrapper.children != null)
diff --git a/Assets/Scripts/UVC/UIToolkit/List/UTKComponentListItemData.cs b/Assets/Scripts/UVC/UIToolkit/List/UTKComponentListItemData.cs
index aaa089e4..60150689 100644
--- a/Assets/Scripts/UVC/UIToolkit/List/UTKComponentListItemData.cs
+++ b/Assets/Scripts/UVC/UIToolkit/List/UTKComponentListItemData.cs
@@ -5,39 +5,22 @@ using System.Collections.Generic;
 namespace UVC.UIToolkit.List
 {
     /// <summary>
-    /// 트리 구조 리스트의 개별 항목 데이터를 나타내는 클래스입니다.
+    /// 트리 구조 리스트의 항목 데이터를 위한 추상 기본 클래스입니다.
     ///
     /// <para><b>개요:</b></para>
     /// <para>
-    /// UTKComponentListItemData는 계층적 트리 구조에서 각 노드(항목)를 표현합니다.
-    /// 부모-자식 관계를 통해 중첩된 트리 구조를 구성할 수 있으며,
+    /// UTKComponentListItemDataBase는 카테고리(UTKComponentListCategoryData)와
+    /// 일반 항목(UTKComponentListItemData)의 공통 속성을 정의합니다.
     /// UTKComponentListWindow(UI)에서 사용됩니다.
     /// </para>
     ///
-    /// <para><b>주요 용도:</b></para>
+    /// <para><b>상속 구조:</b></para>
     /// <list type="bullet">
-    ///   <item>3D glTF 모델의 계층 구조를 UI 트리로 표현</item>
-    ///   <item>트리 리스트에서 항목 선택/확장/가시성 상태 관리</item>
-    ///   <item>모델 뷰어와 트리 리스트 간의 데이터 동기화</item>
+    ///   <item>UTKComponentListCategoryData - 카테고리용 (자식 항목을 가짐)</item>
+    ///   <item>UTKComponentListItemData - 일반 항목용 (리프 노드)</item>
     /// </list>
-    ///
-    /// <para><b>사용 예시:</b></para>
-    /// <code>
-    /// // 루트 항목 생성
-    /// var root = new UTKComponentListItemData { id = 1, name = "루트" };
-    ///
-    /// // 자식 항목 추가
-    /// var child1 = new UTKComponentListItemData { id = 2, name = "자식1" };
-    /// var child2 = new UTKComponentListItemData { id = 3, name = "자식2" };
-    /// root.Add(child1);
-    /// root.Add(child2);
-    ///
-    /// // 손자 항목 추가
-    /// var grandChild = new UTKComponentListItemData { id = 4, name = "손자" };
-    /// child1.Add(grandChild);
-    /// </code>
     /// </summary>
-    public class UTKComponentListItemData: IDisposable
+    public abstract class UTKComponentListItemDataBase : IDisposable
     {
         /// <summary>
         /// 항목의 고유 식별자입니다.
@@ -49,16 +32,9 @@ namespace UVC.UIToolkit.List
         /// <summary>
         /// 항목의 표시 이름입니다.
         /// UI의 TreeView에서 사용자에게 보여지는 텍스트입니다.
-        /// glTF 모델 로드 시 GameObject 이름이 자동으로 설정됩니다.
         /// </summary>
         public string name = string.Empty;
 
-        /// <summary>
-        /// 추가 옵션 또는 설명 텍스트입니다.
-        /// 검색 필터링 시 name과 함께 검색 대상이 됩니다.
-        /// </summary>
-        public string option = string.Empty;
-
         /// <summary>
         /// 트리뷰에서 해당 항목이 펼쳐져 있는지 여부입니다.
         /// true: 자식 항목들이 표시됨 / false: 자식 항목들이 숨겨짐
@@ -71,20 +47,6 @@ namespace UVC.UIToolkit.List
         /// </summary>
         public bool isSelected = false;
 
-        /// <summary>
-        /// 부모 항목에 대한 참조입니다.
-        /// 루트 항목의 경우 null입니다.
-        /// Add() 메서드로 자식을 추가하면 자동으로 설정됩니다.
-        /// </summary>
-        public UTKComponentListItemData? parent;
-
-        /// <summary>
-        /// 자식 항목들의 리스트입니다.
-        /// 재귀적 트리 구조를 형성합니다.
-        /// Add() 메서드를 통해 자식을 추가할 수 있습니다.
-        /// </summary>
-        public List<UTKComponentListItemData> children = new List<UTKComponentListItemData>();
-
         /// <summary>
         /// 해당 항목(및 연결된 3D 오브젝트)의 가시성 상태입니다.
         /// UI의 눈 아이콘 버튼으로 토글되며,
@@ -93,13 +55,6 @@ namespace UVC.UIToolkit.List
         /// </summary>
         public bool IsVisible = true;
 
-        /// <summary>
-        /// 외부 시스템(예: 간트 차트)과의 연동을 위한 외부 키입니다.
-        /// 검색 필터링 시 검색 대상에 포함됩니다.
-        /// 모델과 차트 간의 동기화에 사용될 수 있습니다.
-        /// </summary>
-        public string ExternalKey = string.Empty;
-
         /// <summary>
         /// 검색 결과를 감싸는 임시 그룹 항목인지 여부입니다.
         /// true인 경우 setting-btn이 숨겨지고 클릭되지 않습니다.
@@ -107,29 +62,156 @@ namespace UVC.UIToolkit.List
         /// </summary>
         public bool isSearchResultGroup = false;
 
+        /// <summary>
+        /// 부모 항목에 대한 참조입니다.
+        /// 루트 항목의 경우 null입니다.
+        /// Add() 메서드로 자식을 추가하면 자동으로 설정됩니다.
+        /// </summary>
+        public UTKComponentListItemDataBase? parent;
+
+        /// <summary>
+        /// 자식 항목들의 리스트입니다.
+        /// 카테고리 항목에서만 사용됩니다. 일반 항목에서는 빈 리스트입니다.
+        /// </summary>
+        public abstract List<UTKComponentListItemDataBase> children { get; }
+
+        /// <summary>
+        /// 이 항목이 카테고리인지 여부를 반환합니다.
+        /// </summary>
+        public abstract bool IsCategory { get; }
+
+        /// <summary>
+        /// 리소스를 해제합니다.
+        /// </summary>
+        public virtual void Dispose()
+        {
+            parent = null;
+        }
+    }
+
+    /// <summary>
+    /// 카테고리(그룹) 항목을 나타내는 클래스입니다.
+    /// 자식 항목들을 가질 수 있습니다.
+    ///
+    /// <para><b>사용 예시:</b></para>
+    /// <code>
+    /// // 카테고리 생성
+    /// var category = new UTKComponentListCategoryData { name = "카테고리1" };
+    ///
+    /// // 일반 항목 추가
+    /// var item1 = new UTKComponentListItemData { name = "항목1", option = "옵션1" };
+    /// var item2 = new UTKComponentListItemData { name = "항목2", option = "옵션2" };
+    /// category.Add(item1);
+    /// category.Add(item2);
+    /// </code>
+    /// </summary>
+    public class UTKComponentListCategoryData : UTKComponentListItemDataBase
+    {
+        /// <summary>
+        /// 자식 항목들의 리스트입니다.
+        /// </summary>
+        private List<UTKComponentListItemDataBase> _children = new List<UTKComponentListItemDataBase>();
+
+        /// <summary>
+        /// 자식 항목들의 리스트를 반환합니다.
+        /// </summary>
+        public override List<UTKComponentListItemDataBase> children => _children;
+
+        /// <summary>
+        /// 이 항목이 카테고리임을 나타냅니다.
+        /// </summary>
+        public override bool IsCategory => true;
+
         /// <summary>
         /// 자식 항목을 추가합니다.
         /// 추가되는 자식의 parent 속성이 자동으로 현재 항목으로 설정됩니다.
         /// </summary>
         /// <param name="child">추가할 자식 항목</param>
-        /// <example>
-        /// <code>
-        /// var parent = new UTKComponentListItemData { name = "부모" };
-        /// var child = new UTKComponentListItemData { name = "자식" };
-        /// parent.Add(child);
-        /// // child.parent == parent (자동 설정됨)
-        /// </code>
-        /// </example>
-        public void Add(UTKComponentListItemData child)
+        public void Add(UTKComponentListItemDataBase child)
         {
             child.parent = this;
-            children.Add(child);
+            _children.Add(child);
         }
 
-        public void Dispose()
+        /// <summary>
+        /// 자식 항목을 제거합니다.
+        /// </summary>
+        /// <param name="child">제거할 자식 항목</param>
+        /// <returns>제거 성공 여부</returns>
+        public bool Remove(UTKComponentListItemDataBase child)
         {
-            children.Clear();
-            parent = null;
+            if (_children.Remove(child))
+            {
+                child.parent = null;
+                return true;
+            }
+            return false;
+        }
+
+        /// <summary>
+        /// 모든 자식 항목을 제거합니다.
+        /// </summary>
+        public void Clear()
+        {
+            foreach (var child in _children)
+            {
+                child.parent = null;
+            }
+            _children.Clear();
+        }
+
+        /// <summary>
+        /// 리소스를 해제합니다.
+        /// </summary>
+        public override void Dispose()
+        {
+            Clear();
+            base.Dispose();
         }
     }
-}
\ No newline at end of file
+
+    /// <summary>
+    /// 일반 항목(리프 노드)을 나타내는 클래스입니다.
+    /// 자식 항목을 가지지 않습니다.
+    ///
+    /// <para><b>사용 예시:</b></para>
+    /// <code>
+    /// var item = new UTKComponentListItemData
+    /// {
+    ///     name = "항목 이름",
+    ///     option = "추가 옵션",
+    ///     ExternalKey = "외부 연동 키"
+    /// };
+    /// </code>
+    /// </summary>
+    public class UTKComponentListItemData : UTKComponentListItemDataBase
+    {
+        /// <summary>
+        /// 추가 옵션 또는 설명 텍스트입니다.
+        /// 검색 필터링 시 name과 함께 검색 대상이 됩니다.
+        /// </summary>
+        public string option = string.Empty;
+
+        /// <summary>
+        /// 외부 시스템(예: 간트 차트)과의 연동을 위한 외부 키입니다.
+        /// 검색 필터링 시 검색 대상에 포함됩니다.
+        /// 모델과 차트 간의 동기화에 사용될 수 있습니다.
+        /// </summary>
+        public string ExternalKey = string.Empty;
+
+        /// <summary>
+        /// 일반 항목은 자식을 가지지 않으므로 빈 리스트를 반환합니다.
+        /// </summary>
+        private static readonly List<UTKComponentListItemDataBase> _emptyChildren = new List<UTKComponentListItemDataBase>();
+
+        /// <summary>
+        /// 자식 항목들의 리스트를 반환합니다. 항상 빈 리스트입니다.
+        /// </summary>
+        public override List<UTKComponentListItemDataBase> children => _emptyChildren;
+
+        /// <summary>
+        /// 이 항목이 카테고리가 아님을 나타냅니다.
+        /// </summary>
+        public override bool IsCategory => false;
+    }
+}
diff --git a/Assets/Scripts/UVC/UIToolkit/Window/UTKComponentListWindow.cs b/Assets/Scripts/UVC/UIToolkit/Window/UTKComponentListWindow.cs
index cd31082a..f92d8f7e 100644
--- a/Assets/Scripts/UVC/UIToolkit/Window/UTKComponentListWindow.cs
+++ b/Assets/Scripts/UVC/UIToolkit/Window/UTKComponentListWindow.cs
@@ -65,7 +65,7 @@ namespace UVC.UIToolkit.Window
         /// <summary>
         /// 메인/검색 리스트에서 항목이 선택될 때 발생합니다.
         /// </summary>
-        public Action<List<UTKComponentListItemData>>? OnItemSelected
+        public Action<List<UTKComponentListItemDataBase>>? OnItemSelected
         {
             get => _componentList?.OnItemSelected;
             set { if (_componentList != null) _componentList.OnItemSelected = value; }
@@ -74,7 +74,7 @@ namespace UVC.UIToolkit.Window
         /// <summary>
         /// 메인/검색 리스트에서 항목이 선택 해제될 때 발생합니다.
         /// </summary>
-        public Action<List<UTKComponentListItemData>>? OnItemDeselected
+        public Action<List<UTKComponentListItemDataBase>>? OnItemDeselected
         {
             get => _componentList?.OnItemDeselected;
             set { if (_componentList != null) _componentList.OnItemDeselected = value; }
@@ -83,7 +83,7 @@ namespace UVC.UIToolkit.Window
         /// <summary>
         /// 항목의 가시성(눈 아이콘)이 변경될 때 발생합니다.
         /// </summary>
-        public event Action<UTKComponentListItemData, bool>? OnItemVisibilityChanged
+        public event Action<UTKComponentListItemDataBase, bool>? OnItemVisibilityChanged
         {
             add { if (_componentList != null) _componentList.OnItemVisibilityChanged += value; }
             remove { if (_componentList != null) _componentList.OnItemVisibilityChanged -= value; }
@@ -92,7 +92,7 @@ namespace UVC.UIToolkit.Window
         /// <summary>
         /// 메인/검색 리스트에서 항목이 삭제될 때 발생합니다 (Delete 키).
         /// </summary>
-        public Action<UTKComponentListItemData>? OnItemDeleted
+        public Action<UTKComponentListItemDataBase>? OnItemDeleted
         {
             get => _componentList?.OnItemDeleted;
             set { if (_componentList != null) _componentList.OnItemDeleted = value; }
@@ -101,7 +101,7 @@ namespace UVC.UIToolkit.Window
         /// <summary>
         /// 메인/검색 리스트에서 항목이 더블클릭될 때 발생합니다.
         /// </summary>
-        public Action<UTKComponentListItemData>? OnItemDoubleClicked
+        public Action<UTKComponentListItemDataBase>? OnItemDoubleClicked
         {
             get => _componentList?.OnItemDoubleClicked;
             set { if (_componentList != null) _componentList.OnItemDoubleClicked = value; }
@@ -110,7 +110,7 @@ namespace UVC.UIToolkit.Window
         /// <summary>
         /// 아이콘을 클릭할 때 발생합니다.
         /// </summary>
-        public Action<string, UTKComponentListItemData>? OnItemIconClicked
+        public Action<string, UTKComponentListItemDataBase>? OnItemIconClicked
         {
             get => _componentList?.OnItemIconClicked;
             set { if (_componentList != null) _componentList.OnItemIconClicked = value; }
@@ -174,7 +174,7 @@ namespace UVC.UIToolkit.Window
         /// 트리 데이터를 설정합니다.
         /// </summary>
         /// <param name="roots">루트 항목들의 리스트</param>
-        public void SetData(List<UTKComponentListItemData> roots)
+        public void SetData(List<UTKComponentListItemDataBase> roots)
         {
             _componentList?.SetData(roots);
         }
@@ -202,17 +202,17 @@ namespace UVC.UIToolkit.Window
         /// 루트 레벨에 새 항목을 추가합니다.
         /// </summary>
         /// <param name="data">추가할 항목 데이터</param>
-        public void AddItem(UTKComponentListItemData data)
+        public void AddItem(UTKComponentListItemDataBase data)
         {
             _componentList?.AddItem(data);
         }
 
         /// <summary>
-        /// 지정된 부모 항목의 자식으로 새 항목을 추가합니다.
+        /// 지정된 부모 카테고리의 자식으로 새 항목을 추가합니다.
         /// </summary>
-        /// <param name="parent">부모 항목</param>
+        /// <param name="parent">부모 카테고리</param>
         /// <param name="data">추가할 항목 데이터</param>
-        public void AddItem(UTKComponentListItemData? parent, UTKComponentListItemData data)
+        public void AddItem(UTKComponentListCategoryData? parent, UTKComponentListItemDataBase data)
         {
             _componentList?.AddItem(parent, data);
         }
@@ -221,7 +221,7 @@ namespace UVC.UIToolkit.Window
         /// 트리에서 항목을 완전히 삭제합니다.
         /// </summary>
         /// <param name="data">삭제할 항목 데이터</param>
-        public void DeleteItem(UTKComponentListItemData data)
+        public void DeleteItem(UTKComponentListItemDataBase data)
         {
             _componentList?.DeleteItem(data);
         }
@@ -231,7 +231,7 @@ namespace UVC.UIToolkit.Window
         /// </summary>
         /// <param name="data">변경할 항목 데이터</param>
         /// <param name="newName">새 이름</param>
-        public void SetItemName(UTKComponentListItemData data, string newName)
+        public void SetItemName(UTKComponentListItemDataBase data, string newName)
         {
             _componentList?.SetItemName(data, newName);
         }
diff --git a/Assets/Scripts/UVC/UIToolkit/Window/UTKComponentTabListWindow.cs b/Assets/Scripts/UVC/UIToolkit/Window/UTKComponentTabListWindow.cs
index 0e932aee..e6c45c89 100644
--- a/Assets/Scripts/UVC/UIToolkit/Window/UTKComponentTabListWindow.cs
+++ b/Assets/Scripts/UVC/UIToolkit/Window/UTKComponentTabListWindow.cs
@@ -58,7 +58,7 @@ namespace UVC.UIToolkit.Window
 
         #region 탭 관련 데이터 (Tab Data)
         /// <summary>원본 전체 데이터</summary>
-        private List<UTKComponentListItemData> _originalRoots = new();
+        private List<UTKComponentListItemDataBase> _originalRoots = new();
 
         /// <summary>현재 선택된 탭 인덱스 (-1: 전체)</summary>
         private int _selectedTabIndex = ALL_TAB_INDEX;
@@ -87,7 +87,7 @@ namespace UVC.UIToolkit.Window
         /// <summary>
         /// 메인/검색 리스트에서 항목이 선택될 때 발생합니다.
         /// </summary>
-        public Action<List<UTKComponentListItemData>>? OnItemSelected
+        public Action<List<UTKComponentListItemDataBase>>? OnItemSelected
         {
             get => _componentList?.OnItemSelected;
             set { if (_componentList != null) _componentList.OnItemSelected = value; }
@@ -96,7 +96,7 @@ namespace UVC.UIToolkit.Window
         /// <summary>
         /// 메인/검색 리스트에서 항목이 선택 해제될 때 발생합니다.
         /// </summary>
-        public Action<List<UTKComponentListItemData>>? OnItemDeselected
+        public Action<List<UTKComponentListItemDataBase>>? OnItemDeselected
         {
             get => _componentList?.OnItemDeselected;
             set { if (_componentList != null) _componentList.OnItemDeselected = value; }
@@ -105,7 +105,7 @@ namespace UVC.UIToolkit.Window
         /// <summary>
         /// 항목의 가시성(눈 아이콘)이 변경될 때 발생합니다.
         /// </summary>
-        public event Action<UTKComponentListItemData, bool>? OnItemVisibilityChanged
+        public event Action<UTKComponentListItemDataBase, bool>? OnItemVisibilityChanged
         {
             add { if (_componentList != null) _componentList.OnItemVisibilityChanged += value; }
             remove { if (_componentList != null) _componentList.OnItemVisibilityChanged -= value; }
@@ -114,7 +114,7 @@ namespace UVC.UIToolkit.Window
         /// <summary>
         /// 메인/검색 리스트에서 항목이 삭제될 때 발생합니다 (Delete 키).
         /// </summary>
-        public Action<UTKComponentListItemData>? OnItemDeleted
+        public Action<UTKComponentListItemDataBase>? OnItemDeleted
         {
             get => _componentList?.OnItemDeleted;
             set { if (_componentList != null) _componentList.OnItemDeleted = value; }
@@ -123,7 +123,7 @@ namespace UVC.UIToolkit.Window
         /// <summary>
         /// 메인/검색 리스트에서 항목이 더블클릭될 때 발생합니다.
         /// </summary>
-        public Action<UTKComponentListItemData>? OnItemDoubleClicked
+        public Action<UTKComponentListItemDataBase>? OnItemDoubleClicked
         {
             get => _componentList?.OnItemDoubleClicked;
             set { if (_componentList != null) _componentList.OnItemDoubleClicked = value; }
@@ -132,7 +132,7 @@ namespace UVC.UIToolkit.Window
         /// <summary>
         /// 아이콘을 클릭할 때 발생합니다.
         /// </summary>
-        public Action<string, UTKComponentListItemData>? OnItemIconClicked
+        public Action<string, UTKComponentListItemDataBase>? OnItemIconClicked
         {
             get => _componentList?.OnItemIconClicked;
             set { if (_componentList != null) _componentList.OnItemIconClicked = value; }
@@ -200,9 +200,9 @@ namespace UVC.UIToolkit.Window
         /// 데이터의 카테고리를 분석하여 탭을 자동 생성합니다.
         /// </summary>
         /// <param name="roots">루트 항목들의 리스트</param>
-        public void SetData(List<UTKComponentListItemData> roots)
+        public void SetData(List<UTKComponentListItemDataBase> roots)
         {
-            _originalRoots = roots ?? new List<UTKComponentListItemData>();
+            _originalRoots = roots ?? new List<UTKComponentListItemDataBase>();
 
             // 탭 생성 (카테고리 기반)
             CreateTabs();
@@ -277,7 +277,7 @@ namespace UVC.UIToolkit.Window
         /// 루트 레벨에 새 항목을 추가합니다.
         /// </summary>
         /// <param name="data">추가할 항목 데이터</param>
-        public void AddItem(UTKComponentListItemData data)
+        public void AddItem(UTKComponentListItemDataBase data)
         {
             _originalRoots.Add(data);
             CreateTabs();
@@ -285,11 +285,11 @@ namespace UVC.UIToolkit.Window
         }
 
         /// <summary>
-        /// 지정된 부모 항목의 자식으로 새 항목을 추가합니다.
+        /// 지정된 부모 카테고리의 자식으로 새 항목을 추가합니다.
         /// </summary>
-        /// <param name="parent">부모 항목</param>
+        /// <param name="parent">부모 카테고리</param>
         /// <param name="data">추가할 항목 데이터</param>
-        public void AddItem(UTKComponentListItemData? parent, UTKComponentListItemData data)
+        public void AddItem(UTKComponentListCategoryData? parent, UTKComponentListItemDataBase data)
         {
             if (parent == null)
             {
@@ -297,8 +297,7 @@ namespace UVC.UIToolkit.Window
                 return;
             }
 
-            parent.children ??= new List<UTKComponentListItemData>();
-            parent.children.Add(data);
+            parent.Add(data);
 
             // 탭 및 표시 갱신
             CreateTabs();
@@ -309,7 +308,7 @@ namespace UVC.UIToolkit.Window
         /// 트리에서 항목을 완전히 삭제합니다.
         /// </summary>
         /// <param name="data">삭제할 항목 데이터</param>
-        public void DeleteItem(UTKComponentListItemData data)
+        public void DeleteItem(UTKComponentListItemDataBase data)
         {
             if (RemoveItemFromRoots(data))
             {
@@ -323,7 +322,7 @@ namespace UVC.UIToolkit.Window
         /// </summary>
         /// <param name="data">변경할 항목 데이터</param>
         /// <param name="newName">새 이름</param>
-        public void SetItemName(UTKComponentListItemData data, string newName)
+        public void SetItemName(UTKComponentListItemDataBase data, string newName)
         {
             _componentList?.SetItemName(data, newName);
         }
@@ -374,9 +373,9 @@ namespace UVC.UIToolkit.Window
             _tabContainer.Add(allTab);
             _tabButtons.Add(allTab);
 
-            // 카테고리별 탭 생성 (루트 항목들이 그룹이면 해당 이름으로 탭 생성)
+            // 카테고리별 탭 생성 (카테고리 타입인 항목들만 탭으로 표시)
             var categories = _originalRoots
-                .Where(r => r.children != null && r.children.Count > 0)
+                .Where(r => r.IsCategory && r.children.Count > 0)
                 .Select(r => r.name)
                 .Distinct()
                 .ToList();
@@ -433,7 +432,7 @@ namespace UVC.UIToolkit.Window
         /// </summary>
         /// <param name="tabIndex">탭 인덱스 (-1: 전체)</param>
         /// <returns>필터링된 데이터</returns>
-        private List<UTKComponentListItemData> FilterDataByTab(int tabIndex)
+        private List<UTKComponentListItemDataBase> FilterDataByTab(int tabIndex)
         {
             // 전체 탭이면 모든 데이터 반환
             if (tabIndex == ALL_TAB_INDEX)
@@ -443,12 +442,12 @@ namespace UVC.UIToolkit.Window
 
             // 카테고리 탭이면 해당 카테고리의 자식들만 반환 (부모 없이 자식만 표시)
             var categories = _originalRoots
-                .Where(r => r.children != null && r.children.Count > 0)
+                .Where(r => r.IsCategory && r.children.Count > 0)
                 .ToList();
 
             if (tabIndex >= 0 && tabIndex < categories.Count)
             {
-                return categories[tabIndex].children ?? new List<UTKComponentListItemData>();
+                return categories[tabIndex].children ?? new List<UTKComponentListItemDataBase>();
             }
 
             return _originalRoots;
@@ -461,7 +460,7 @@ namespace UVC.UIToolkit.Window
         /// </summary>
         /// <param name="target">삭제할 항목</param>
         /// <returns>삭제 성공 여부</returns>
-        private bool RemoveItemFromRoots(UTKComponentListItemData target)
+        private bool RemoveItemFromRoots(UTKComponentListItemDataBase target)
         {
             if (_originalRoots.Remove(target))
             {
@@ -485,13 +484,17 @@ namespace UVC.UIToolkit.Window
         /// <param name="parent">부모 노드</param>
         /// <param name="target">삭제할 대상 항목</param>
         /// <returns>삭제 성공 여부</returns>
-        private bool RemoveFromChildren(UTKComponentListItemData parent, UTKComponentListItemData target)
+        private bool RemoveFromChildren(UTKComponentListItemDataBase parent, UTKComponentListItemDataBase target)
         {
             if (parent.children == null || parent.children.Count == 0) return false;
 
-            if (parent.children.Remove(target))
+            // 카테고리인 경우에만 자식에서 삭제 가능
+            if (parent is UTKComponentListCategoryData category)
             {
-                return true;
+                if (category.Remove(target))
+                {
+                    return true;
+                }
             }
 
             foreach (var child in parent.children)