If you are using Sonar 2 or 3, use Per-Project Audio folders. This way you can always quickly and easily see which .WAV files belong to which clips.
300Mb for a .BUN file for 10 tracks doesn't sound that large. I have numerous things running around here which are well over the 1Gig mark.
Normally all of your audio live in the CAKEWALK PROJECTS\AUDIO DATA, maybe just AUDIO DATA if you are using an older version.
DON"T DELETE ANY .WAV FILES MANUALLY!!!!!!!!!!!!!!!!!!!
Download and run the Cakewalk Audio Finder tool from the support section of their website. This is an automated tool which will match existing .WAV files with their projects. It also identifies orphaned files, (.WAV files without a project), that CAN be safely deleted.
Ciao,
Q.