OK, I got my little carving done, only took about 4 hours... JK, it was a learning curve.
But I am having a problem getting the component to intersect with a face of my model. I have tried everything that I can understand, but nothing I do seems to want to allow me to intersect the component with the model so I can clean out the inside of the carvings.
I tried exploding the components, selecting all, tried all three of the Intersect methods in SU7, in SU8 the Intersect option states that there are no solids in the model to intersect.
Pic and .skp attached.
Low_Wall_Case.skp