When you want to go from one layout (level) to another, use the System-> goto layout action. If you want to restart a layout, just go to the same layout. I'm trying to think if I have any examples of switching layouts posted on drop box...
Ah! Yes. Check out this thread. There are three examples I link to. In one example a new level is generated each time in the same layout, and in another you go to one of 6 or so different layouts. The third one is sort of a combination, and I think the best one of the three. But there are many ways to accomplish tasks in C2.
Creating levels and transitioning between them