Originally Posted by
c-hawk
Set the door frame family to the door category. Create a shared parameter for the frame mark and add it to the frame family. Make sure this family is shared. Nest this family in your door family. Load the door family into your project. Create a door schedule. The frame mark parameter should be available to incorporate into a door schedule.
I'm running this from memory and haven't investigated connecting it to your process of selecting the frame per door instance. It depends on the structure of your nested frame family.