Use case: a Sonos Amp goes in the rack, but it's for the bathroom speakers. Do I put it in the rack area of the proposal, or in the bathroom area? It's important to keep track of where things physically go AND where they are best represented to the client in the proposal - many times they want to know (at least roughly) what an additional room will cost them while we want to record important information to keep our installers moving quickly.

Next to duplicate, add/remove, etc on the part context menu, there could be a button to link the part from a dropdown list that populates with all of the current areas in the proposal.