Open wavelab and load your files.
Go to file (top left hand corner) > New > audio montage
Pick your sample rate
Now, in the new window that pops up on the left you should see a few small buttons clear on the left, no fx and one that says "1".
What I would do is hit the "1" > add mono track
Now either repeat 4 times or go to the "1" and hit clone track until you have as many tracks as you need
then go to your stereo track, hit the "1" and delete it
Now, go to your recorded tracks, highlight and copy each individual channel and copy and paste them into the mono tracks you just made.
Now you have all 4 channels you recorded in wavelab
If you right click on each track in montage view and look toward the bottom of the window that pops up you will see "show envelope". Select this and then go to "pan".
Now if you click on the center line of each channel and drag, the line will move to represent where you want the channel positioned in your final mix.
Hope that makes sense.