i have 1 top level assembly. inside this assembly i have 2 parts, and 2 subassemblies. inside the first subassembly, i have 2 parts. inside the second subassembly i have 1 part and one more sub-subassembly. inside that sub-subassembly, i have one more part. each of these parts all have a "height" and these heights will always be the same. how do i set up a parameter called height so that when i change