yes you sure can bud.
Go to NEW>Audio Montage
go down to the grey area of the screen and right click. you will see the option to ADD FILE. add the first track.
then click on the dropdown bar with the 1 on it. click ADD MONO TRACK
you now have the two mono tracks there. on the mastering tool on the right side..click RENDER.
itll render the file to a stereo track (or whatever you want it to be..youll see different options)save the file.
after that one is done , open up the next 2 the same way .after the file is rendered you will be in the regular Wavelab screen so you can normalize, compress, whatever.. save em.
Teddy