diff --git a/hippolyzer/lib/base/inventory.py b/hippolyzer/lib/base/inventory.py
index cbe9f08..a86b706 100644
--- a/hippolyzer/lib/base/inventory.py
+++ b/hippolyzer/lib/base/inventory.py
@@ -285,6 +285,8 @@ class InventorySaleInfo(InventoryBase):
 class InventoryNodeBase(InventoryBase):
     ID_ATTR: ClassVar[str]
 
+    name: str
+
     parent_id: Optional[UUID] = schema_field(SchemaUUID)
     model: Optional[InventoryModel] = dataclasses.field(
         default=None, init=False, hash=False, compare=False, repr=False
@@ -317,6 +319,12 @@ class InventoryNodeBase(InventoryBase):
     def __hash__(self):
         return hash(self.node_id)
 
+    def __iter__(self) -> Iterator[InventoryNodeBase]:
+        return iter(())
+
+    def __contains__(self, item) -> bool:
+        return item in tuple(self)
+
 
 @dataclasses.dataclass
 class InventoryContainerBase(InventoryNodeBase):
@@ -330,6 +338,34 @@ class InventoryContainerBase(InventoryNodeBase):
             if x.parent_id == self.node_id
         )
 
+    def __getitem__(self, item: Union[int, str]) -> InventoryNodeBase:
+        if isinstance(item, int):
+            return self.children[item]
+
+        for child in self.children:
+            if child.name == item:
+                return child
+        raise KeyError(f"{item!r} not found in children")
+
+    def __iter__(self) -> Iterator[InventoryNodeBase]:
+        return iter(self.children)
+
+    def get_or_create_subcategory(self, name: str) -> InventoryCategory:
+        for child in self:
+            if child.name == name and isinstance(child, InventoryCategory):
+                return child
+        child = InventoryCategory(
+            name=name,
+            cat_id=UUID.random(),
+            parent_id=self.node_id,
+            type="category",
+            pref_type="-1",
+            owner_id=getattr(self, 'owner_id', UUID.ZERO),
+            version=1,
+        )
+        self.model.add(child)
+        return child
+
     # So autogenerated __hash__ doesn't kill our inherited one
     __hash__ = InventoryNodeBase.__hash__
 
@@ -347,7 +383,7 @@ class InventoryObject(InventoryContainerBase):
 @dataclasses.dataclass
 class InventoryCategory(InventoryContainerBase):
     ID_ATTR: ClassVar[str] = "cat_id"
-    SCHEMA_NAME: ClassVar[str] = "inv_object"
+    SCHEMA_NAME: ClassVar[str] = "inv_category"
 
     cat_id: UUID = schema_field(SchemaUUID)
     pref_type: str = schema_field(SchemaStr, llsd_name="preferred_type")
diff --git a/hippolyzer/lib/proxy/addon_utils.py b/hippolyzer/lib/proxy/addon_utils.py
index 9850916..215c435 100644
--- a/hippolyzer/lib/proxy/addon_utils.py
+++ b/hippolyzer/lib/proxy/addon_utils.py
@@ -134,7 +134,7 @@ def ais_folder_to_inventory_data(ais_folder: dict):
         FolderID=ais_folder["cat_id"],
         ParentID=ais_folder["parent_id"],
         CallbackID=0,
-        Type=ais_folder["type"],
+        Type=ais_folder["preferred_type"],
         Name=ais_folder["name"],
     )