how to place new mixed audio back into edited time line

HI,

I'm using the new version of premiere pro and I'm new at editting. I have a project I shot from three days and two nights all on one camera. I have multiple audio sources that a freind is going to marry and create the final tracks. My problem is that I want to edit before he finishes the tracks. My final time line will consist of multiple cuts from different times. how do I, or where do I replace the old audio with the new audio tracks. My time line will be all cut up so I cant imagine haveing to go to each clip and line up the new audio. What is the best way to change the old audio out on the full length clips so it will change the same footage audio that I cut up on the time line ... is that possible in the media / preview stage. what are the steps, if it is possible to go about it this way.

thank you . james