I am open for ideas!

Within my assemblies I could be using a library part multiple times, and each instance of the part needs multiple unique tags or properties assigned to it, in relation to that assembly alone. Since these are library parts, I can't assign properties to the part file as every assembly will be different. Very similar to component reference but with that, I am limited to only one entry.

For example, in a assembly I could have multiple flanges, and each flange needs to have ~3 unique properties assigned to it.

Unique Properties required could be, TAG, SERVICE, SERIAL # 

Flange instance <1> N1, INLET, 3254

Flange instance <2> N2, OUTLET, 3255