All I wanna do is to make a hole for a window in all wall. But no...Carrara is mean and evil to Sky :-( I open Carrara. Stay in the first work space. No jumping to any vertex room or anything else. Make a cube, put another cube into the first one as the hole. Choose the boolean command, make the hole...BUT...THE EDGES in the hole is some kind of flossy. Its like Carrara do not take all the...ehhh...wall-cube away in the hole !!! Yeah, I know Im not very good at explaining, but I really hope you understand and can help. Sky :-)