I've spent 2 days watching videos and I still don't understand, I've used lots of CAD / CAM software over the years, but this thing, I'm trying to help my student daughter understand it, her college don't seem to understand it either, and of course send them away to figure it out for themselves.
If we draw a simple 3d cube, then draw a circle on a face, then cut a hole into the cube, the cube and the hole become one and we cant delete the hole without deleting the hole and cube, is that right?????