How to access all audio clips after i'm done editing with multicam sequence?

You can access the original audio clips from your multicam sequence by following these steps:

1. Disable the Nest button (located under the timeline timecode). 
   

    

2. Select each clip in the timeline.
3. Press F to perform a Match Frame.
4. Press . (Period key) to overwrite the clip back into the timeline.
   
   

This will replace the multicam clip with the original source clip while maintaining your edits.

I usually just copy and paste them from the multicam timeline to the edit master timeline and then mute the tracks from the multi-cam sequence on the edit master timeline -- or delete - you can always get 'em right back with an insert edit.