Use the Grouping Tool to duplicate the "Floor" and create the "Ceiling"

With the "Ceiling" selected ...

Change yTran to 1.20 to raise the "Ceiling" up 120" or 10'

Note that the "Ceiling" will sit exactly on top of the walls.

Remember ... "With Poser, all things are possible, and poseable!"

cheers,

dr geep ... :o]

edited 10/5/2019