diff --git a/src/blenderbim/Makefile b/src/blenderbim/Makefile
index f90728a02e..973b705fc2 100644
--- a/src/blenderbim/Makefile
+++ b/src/blenderbim/Makefile
@@ -188,7 +188,7 @@ endif
 	mkdir dist/working
 	cd dist/working && wget https://raw.githubusercontent.com/jsGanttImproved/jsgantt-improved/master/dist/jsgantt.js
 	cd dist/working && wget https://raw.githubusercontent.com/jsGanttImproved/jsgantt-improved/master/dist/jsgantt.css
-	cd dist/working && mv jsgantt* dist/blenderbim/bim/data/gantt/
+	cp dist/working/jsgantt* dist/blenderbim/bim/data/gantt/
 	rm -rf dist/working
 
 	# Required by IFCDiff
diff --git a/src/blenderbim/blenderbim/bim/module/project/__init__.py b/src/blenderbim/blenderbim/bim/module/project/__init__.py
index 576a026de3..d05306f3ce 100644
--- a/src/blenderbim/blenderbim/bim/module/project/__init__.py
+++ b/src/blenderbim/blenderbim/bim/module/project/__init__.py
@@ -12,6 +12,7 @@ classes = (
     operator.AssignLibraryDeclaration,
     operator.UnassignLibraryDeclaration,
     operator.SaveLibraryFile,
+    operator.AppendLibraryElement,
     prop.LibraryElement,
     prop.BIMProjectProperties,
     ui.BIM_PT_project,
diff --git a/src/blenderbim/blenderbim/bim/module/project/operator.py b/src/blenderbim/blenderbim/bim/module/project/operator.py
index 36eebc2549..a1c279c71c 100644
--- a/src/blenderbim/blenderbim/bim/module/project/operator.py
+++ b/src/blenderbim/blenderbim/bim/module/project/operator.py
@@ -4,6 +4,7 @@ import ifcopenshell
 import ifcopenshell.api
 import bpy
 from blenderbim.bim.ifc import IfcStore
+from blenderbim.bim import import_ifc
 
 
 class CreateProject(bpy.types.Operator):
@@ -220,3 +221,37 @@ class SaveLibraryFile(bpy.types.Operator):
     def execute(self, context):
         IfcStore.library_file.write(IfcStore.library_path)
         return {"FINISHED"}
+
+
+class AppendLibraryElement(bpy.types.Operator):
+    bl_idname = "bim.append_library_element"
+    bl_label = "Append Library Element"
+    definition: bpy.props.IntProperty()
+
+    def execute(self, context):
+        element = ifcopenshell.api.run(
+            "project.append_asset",
+            IfcStore.get_file(),
+            element=IfcStore.library_file.by_id(self.definition),
+        )
+        self.import_type_from_ifc(element)
+        return {"FINISHED"}
+
+    def import_type_from_ifc(self, element):
+        self.file = IfcStore.get_file()
+        logger = logging.getLogger("ImportIFC")
+        ifc_import_settings = import_ifc.IfcImportSettings.factory(bpy.context, IfcStore.path, logger)
+
+        type_collection = bpy.data.collections.get("Types")
+        if not type_collection:
+            type_collection = bpy.data.collections.new("Types")
+            for collection in bpy.data.collections:
+                if "IfcProject/" in collection.name:
+                    collection.children.link(type_collection)
+                    break
+
+        ifc_importer = import_ifc.IfcImporter(ifc_import_settings)
+        ifc_importer.file = self.file
+        ifc_importer.type_collection = type_collection
+        ifc_importer.create_type_product(element)
+        ifc_importer.place_objects_in_spatial_tree()
diff --git a/src/blenderbim/blenderbim/bim/module/project/ui.py b/src/blenderbim/blenderbim/bim/module/project/ui.py
index 4c62ad5c8d..82006ba3e1 100644
--- a/src/blenderbim/blenderbim/bim/module/project/ui.py
+++ b/src/blenderbim/blenderbim/bim/module/project/ui.py
@@ -71,6 +71,7 @@ class BIM_PT_project(Panel):
 class BIM_PT_project_library(Panel):
     bl_label = "IFC Project Library"
     bl_idname = "BIM_PT_project_library"
+    bl_options = {"DEFAULT_CLOSED"}
     bl_space_type = "PROPERTIES"
     bl_region_type = "WINDOW"
     bl_context = "scene"
@@ -117,14 +118,16 @@ class BIM_UL_library(UIList):
                 op.element_name = item.name
             row.label(text=item.name)
             if (
-                not item.ifc_definition_id
-                or IfcStore.library_file.schema == "IFC2X3"
-                or not IfcStore.library_file.by_type("IfcProjectLibrary")
+                item.ifc_definition_id
+                and IfcStore.library_file.schema != "IFC2X3"
+                and IfcStore.library_file.by_type("IfcProjectLibrary")
             ):
-                return
-            if item.is_declared:
-                op = row.operator("bim.unassign_library_declaration", text="", icon="KEYFRAME_HLT", emboss=False)
-                op.definition = item.ifc_definition_id
-            else:
-                op = row.operator("bim.assign_library_declaration", text="", icon="KEYFRAME", emboss=False)
+                if item.is_declared:
+                    op = row.operator("bim.unassign_library_declaration", text="", icon="KEYFRAME_HLT", emboss=False)
+                    op.definition = item.ifc_definition_id
+                else:
+                    op = row.operator("bim.assign_library_declaration", text="", icon="KEYFRAME", emboss=False)
+                    op.definition = item.ifc_definition_id
+            if item.ifc_definition_id:
+                op = row.operator("bim.append_library_element", text="", icon="APPEND_BLEND")
                 op.definition = item.ifc_definition_id
diff --git a/src/ifcopenshell-python/ifcopenshell/api/cost/add_cost_item.py b/src/ifcopenshell-python/ifcopenshell/api/cost/add_cost_item.py
index 9d9b017f18..dc1aa1e29c 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/cost/add_cost_item.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/cost/add_cost_item.py
@@ -23,6 +23,6 @@ class Usecase:
             )
         elif self.settings["cost_item"]:
             ifcopenshell.api.run(
-                "nest.assign_object", self.file, object=cost_item, relating_object=self.settings["cost_item"]
+                "nest.assign_object", self.file, related_object=cost_item, relating_object=self.settings["cost_item"]
             )
         return cost_item