For Internal Doors make sure to hide the Wall Layer so that External Doors are not given the same Element ID.
Select the sixth icon (Element ID Manager) on the Actually Toolbar.
Ensure the “Door Element Type” is chosen.
Click “Width” and “Height” in the Available Criteria box.
Click “Add” to add them to Selected Criteria.
Note: This method of identification ensures matching units merge within Actually.
Ensure all boxes are formatted correctly using a prefix such as “ID”.