You would probably get better help with AutoCAD 3D solids on the AutoCAD message boards.
Did you use the Subtract command on the objects? If not this look at the Union command and the other solid edit command on the ribbon panel shown.
John Mayo
the subtract command subtracts the whole pink solid and leaves the empty shape in the sphere, I just need to cut the part that sticks out from the bottom of the sphere!
no luck with union either
but thanks! trying on autocad 3d solids!