Syncing edited audio with edited video

Ok don't really know how to explain what I am doing.

I shot a 17 minute video with audio and have brought it into Premier. I extracted the audio and edited it down in Audition to about 12 minutes. I then edited the video down to about 5 minutes as I want the remaining time to be filled with stills inserted between the clips. I now realize I have done this completely wrong, as I am unable now to sync my audio with the video clips, realizing I had eliminated the audio of the clips in some cases. Is there any help here for showing me how to do this right?

Stuart