Revit :: Creating A Pull Down Menu

I am trying to create a pull down menu in a door schedule. My goal is that when I load a door family into my model it will generate as much as the required schedule information as possible. Eliminating the need to manually fill out the schedule.

I have already set up shared parameters for typical schedule items; such as door material, door type, frame material, etc. I would like to set up pull down menus for the schedule items that will differ from door to door (fire rating for example), via the door family type parameters. The research I've done seems to point to using nested families. This is something I am not all that familiar with. Do I need to use nested families to do what I'm trying? If so, what would be the best way to do it? How would I create a nested family?