Lumion pro 10 help

Is anyone here a lumion 10 pro user? If so, im running into a slight issue with the work flow of it.

My model is fully solid and has no materials on it from sketchup. Just default colors from my style. I import the solid model into lumion and i try to apply a material to the object, and it applies it to the whole model.

How do i get lumion to apply materials to each seperate face?