Ive read the only tutorial hereon clipping. Its the one where you create a hallway. I know using it is "evil", but I want to know how to use it. I draw my blue line with it, it shows a white highlight of what it will cut, but HOW DO I ACTUALLY CUT IT? I double click, I try using the cut icon on top, but it wont cut. Is there a keyboard shortcut to cut it? Can someone help me, or point me to a tutorial?