title: Shorten part of a component (basically cut out a piece)
body: <p>I build my desk in Sketchup, but for some reason it turned out twenty centimeters too long. So I want to shorten it but I can't figure out how to do this. I basically need to cut out two parts of ten centimeter without changing anything else, see the <a href="http://i.stack.imgur.com/icCNq.jpg" rel="nofollow">picture</a> for clarification. How do I do this?</p>