How do I stop Chief Architect from changing multiple rooms/levels when I change the ceiling height of one room? On a split level house, if I change the height of the kitchen, all the walls on the adjoining level drop to the height of the kitchen wall. So the kitchen wall is 9 feet, and the bedroom walls are 5 feet. If I change the bedrooms back, the kitchen wall becomes 14 feet tall. The kitchen isn't even touching the exterior wall between the two levels. I've tried room dividers to separate the two. I've only had the program for a couple weeks, and I'm at a standstill.