Are you talking about intensity for a device? You can do that by making a group with one fixture and moving that group to a master, creating an inhibitive sub for one fixture.
None of the above. I wish to assign a fader on an expansion wing, say fader 1 to act as a submaster for anything contained within the wing, so dropping the fader will proportionately drop anything on the wing, but only on the wing. A GM for the wing if you like.
Good idea. In the meantime you can create an inhibitive master with all fixtures acting in the cues that are on the wing. It is less easier but it is working like a wing master.