For exporting a multitrack .wav file, you have to start a project with a multichannel audiomaster (3-16 tracks).
Copy and paste your complete edit to the new editsetting.
Now in the audiomixer you can route your audiolayers to the multichannel you like.
(CH1+2 pan to left is channel 1, pan to right is channel 2 and for a stereo track pan to center : channel 1 for left and channel 2 for right.)
Then you export your project to a 3-16 tracks multitrack .wav file.
When you need mono tracks you can import your multitrack .wav file in premiere. Then send it to Audition (edit in Audition) and then adobe will convert the file into mono tracks.
You'll find the mono tracks in your audio capture folder or can premiere search for then by 'reveal in explorer'.
The multi track .wav file has got timecode within the file.
When exporting in QT you can also choose for a multitrack audio file. It also contains your timeline timecode.
.avi or .mp4 video files cannot be exported with more than 5.1 channels of audio
MXF OP1a in XDCAMHD can also be exported with max. 16 channels of audio. It also contains your timeline timecode.
Hopefully you can get further with Premiere Pro with this info.
Succes with it!!