Hi,
I bet that there is a really simple solution to this but I'm unable to find it in the Sonar help section.
How do I select just the left or right channel of a stereo track so that I can delete the sound on it before I convert the track to mono.
The side that I want to select has some noise on it and it mixes with the other side when I convert it to mono. 
 
What is the easiest way to do this?
 
Thanks
Craig

I'm not sure either ....
 
but what you can do is:
A.
1. Solo (isolate) the stereo track
2. Create a new audio track
  2a. Solo that track too
  2b. Arm it to record
  2c. Set it's input to the desired L or R of your audio interface
  (You can trial hear it by pressing 'echo on' pressing play. - Dunno if it's just my interface but sometimes I've hit 'echo on' a couple of times to get rid of a static sounding crackle).
3. Press Record (to record that channel to the new track).
(You can then use the convert to stereo/mono on the new clip as you wish).
 
B.
Have a play with the Channel Tool FX on the original track.
You can turn the gain right down on either of the L/R channels.
You can use the sliders to set how far L/R either channel is and the stereo width of it.

Perhaps simipler is:
 
C.
1. Select your track/clip
2. Tracks > Bounce to Track(s) ...
  2a. Source Category  - Tracks
  2b. Channel Format - Split Mono
  2c. OK
 
Two mono tracks are created - prepanned in the correct direction (which you can alter)
 

Thanks!