How can I clip one or more multi-polygons to another polygon?

I recently got CC3 although I used CC2 a bit years ago. In any case I was wondering if there was a way to clip a multi-polygon to another polygon such that anything outside the clip polygon is eliminated. I tried trim but it doesn't seem to do anything. I'm a graphics programmer and I have written this before in C++ however I can't seem to find it in CC3. Any help would be much appreciated.
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