diff --git a/src/blenderbim/blenderbim/core/root.py b/src/blenderbim/blenderbim/core/root.py
index bb3ede124c..67e1ebe856 100644
--- a/src/blenderbim/blenderbim/core/root.py
+++ b/src/blenderbim/blenderbim/core/root.py
@@ -38,7 +38,7 @@ def copy_class(ifc, collector, geometry, root, obj=None):
             )
     collector.assign(obj)
     if root.is_opening_element(element):
-        root.add_dynamic_opening_voids(element, obj)
+        root.add_tracked_opening(obj)
 
 
 def assign_class(
diff --git a/src/blenderbim/blenderbim/core/tool.py b/src/blenderbim/blenderbim/core/tool.py
index 003385e2dc..b12e935916 100644
--- a/src/blenderbim/blenderbim/core/tool.py
+++ b/src/blenderbim/blenderbim/core/tool.py
@@ -444,7 +444,7 @@ class Resource:
 
 @interface
 class Root:
-    def add_dynamic_opening_voids(cls, element, obj): pass
+    def add_tracked_opening(cls, obj): pass
     def does_type_have_representations(cls, element): pass
     def get_element_type(cls, element): pass
     def get_object_name(cls, obj): pass
diff --git a/src/blenderbim/blenderbim/tool/root.py b/src/blenderbim/blenderbim/tool/root.py
index cf1fbecb20..34faeb540f 100644
--- a/src/blenderbim/blenderbim/tool/root.py
+++ b/src/blenderbim/blenderbim/tool/root.py
@@ -26,19 +26,9 @@ from mathutils import Vector
 
 class Root(blenderbim.core.tool.Root):
     @classmethod
-    def add_dynamic_opening_voids(cls, element, obj):
-        for rel in element.VoidsElements:
-            building_obj = tool.Ifc.get_object(rel.RelatingBuildingElement)
-            try:
-                modifier = next(m for m in obj.modifiers if m.type == "BOOLEAN" and m.object == obj)
-            except StopIteration:
-                modifier = building_obj.modifiers.new("IfcOpeningElement", "BOOLEAN")
-                modifier.object = obj
-            finally:
-                modifier.operation = "DIFFERENCE"
-                modifier.solver = "EXACT"
-                modifier.use_self = True
-                modifier.operand_type = "OBJECT"
+    def add_tracked_opening(cls, obj):
+        new = bpy.context.scene.BIMModelProperties.openings.add()
+        new.obj = obj
 
     @classmethod
     def does_type_have_representations(cls, element):
diff --git a/src/blenderbim/test/core/test_root.py b/src/blenderbim/test/core/test_root.py
index 1e37e1d926..f2f35f5a65 100644
--- a/src/blenderbim/test/core/test_root.py
+++ b/src/blenderbim/test/core/test_root.py
@@ -86,7 +86,7 @@ class TestCopyClass:
         root.link_object_data("type_obj", "obj").should_be_called()
         collector.assign("obj").should_be_called()
         root.is_opening_element("element").should_be_called().will_return(True)
-        root.add_dynamic_opening_voids("element", "obj").should_be_called()
+        root.add_tracked_opening("obj").should_be_called()
         subject.copy_class(ifc, collector, geometry, root, obj="obj")
 
 
diff --git a/src/blenderbim/test/tool/test_root.py b/src/blenderbim/test/tool/test_root.py
index ef71a0effa..abde5e5a17 100644
--- a/src/blenderbim/test/tool/test_root.py
+++ b/src/blenderbim/test/tool/test_root.py
@@ -29,30 +29,12 @@ class TestImplementsTool(NewFile):
         assert isinstance(subject(), blenderbim.core.tool.Root)
 
 
-class TestAddDynamicOpeningVoids(NewFile):
+class TestAddTrackedOpening(NewFile):
     def test_run(self):
-        ifc = ifcopenshell.file()
-        tool.Ifc.set(ifc)
-
-        obj = bpy.data.objects.new("Object", bpy.data.meshes.new("Mesh"))
-        element = ifc.createIfcOpeningElement()
-        tool.Ifc.link(element, obj)
-
-        wall_obj = bpy.data.objects.new("Object", bpy.data.meshes.new("Mesh"))
-        wall_element = ifc.createIfcOpeningElement()
-        tool.Ifc.link(wall_element, wall_obj)
-
-        ifcopenshell.api.run("void.add_opening", ifc, opening=element, element=wall_element)
-
-        subject.add_dynamic_opening_voids(element, obj)
-
-        modifier = wall_obj.modifiers[0]
-        assert modifier.type == "BOOLEAN"
-        assert modifier.name == "IfcOpeningElement"
-        assert modifier.operation == "DIFFERENCE"
-        assert modifier.object == obj
-        assert modifier.solver == "EXACT"
-        assert modifier.use_self is True
+        obj = bpy.data.objects.new("Object", None)
+        subject.add_tracked_opening(obj)
+        props = bpy.context.scene.BIMModelProperties
+        assert props.openings[0].obj == obj
 
 
 class TestDoesTypeHaveRepresentations(NewFile):