Is it possible to change the height of a single room using automatic tools and not reverting to custom ceiling planes? The main structure is 9' ceilings, the living room needs to be 12' clipped in to the rafters on one side. I feel certain I've successfully accomplished this before but completely in the interior of the house (not at exterior wall).
Is the exterior wall causing the whole floor to be built at the living room height?
Can this be specified with roof build,
Your problem is that you have an attic room defined over the top of that area. When you change the ceiling height in one room below, Chief thinks that it needs to push the whole floor system up to accommodate the attic floor system...and therefore moves the entire ceiling up. Not sure why you have it there, but one way or another, all you need to do is break that attic room definition and you should be good to go.