Seems like In-Place families are a tough one to chew. I’ve been trying to find a way to change In-placeFamilies specifically changing the Category part.
There’s a node from Synthesize the works with loaded families but not in place (seems like EditFamily method only works with loaded families) and I also looked into Revit API but couldn’t find anything to modify them.
The Second part is wondering if its possible to force some system parameter(or built in?) like wall length or length into in-place families so they can be modified in schedule?