Solid problems in ACAD2012

I got a problem - how to divide sector on faces(solids) of fasad beetwen decorative elements ?
By my mistake with command union I put toghether all walls and also the roof. :(((
I am the new one with work in 3D acad
I got a problem - how to divide sector on faces(solids) of fasad beetwen decorative elements ?
By my mistake with command union I put toghether all walls and also the roof. :(((
I am the new one with work in 3D acad