How can I make a synced audio track match the length of selected clips in a multicam seq?

I have a continuous multicam sequence of about 13 minutes containing a synced master audio track recorded from seperate microphones. I want to rearrange scenes from it into my final sequence, but when I select a range of clips to nest the entire length of audio gets pasted into the new sequence. I want to trim the audio to match just the clips I've selected but not lose sync. Is there a way to do this or is nesting not the way to chop up a sequence and rearrange the scenes in it?

Thanks.

Mike