I want to add have a layer that references another layers another turns it on and off as necessary. For example,i have assemblyA, B, C, and D. I would add assembly A to a layer, B to a layer, etc. I could then make a layer that would control say layers B, C, and D, isolating A. It seems simple enough, and the sublayers are added to the one master layer but the master layers doesn't control them. Basically, it is the isolate function from SW done in the cumbersome, a$$ backwards Pro/E way. Say what you will but SW rocks in layer and BOM manipulation.