Adding Cupla affects entire plan

[BB boy]

Bob..
If you are ever able to manually draw the cupola, you CAN put a round roof on it. The round roof is floor 3.
Also, when I added floor 3, the ceiling heights on floor 2 changed and I had to reset them. Could this be what is happening on your floor 1 when you add the cupola?

JoAnn, thanks. I was not trying to do a round roof, just a round top VENT/LOUVER. That IS a good thing to know. In my practice plan, I used a fixed glass window, w/arched head changed the material for the glass to a "louver" bladed mat'l. BUT until I can figure out how to build it on my finished plan, I will just use the one from the library.