Wow Jean, thanks so much. That is a great tutorial.
Luckily we are having winter weather, unlike last year, so I am able to spend some good time just playing with , oh er, I mean working with SketchUp 8 Pro.
Your method would work with the free version and Pro, one of the reasons I went with Pro was the "Solid Tools" specifically for the Subtract method of which I have a new challenge. I just posted a new question about Holeshttp://sketchucation.com/forums/viewtopic.php?f=79&t=50714&e=0. My top surface has some bumps so I cannot just push object one through object two, or I would have to know how to make some dimples on the top inside surface.
Thanks once again Jean.
Ralph