Is it possible to mix multiple tracks to a stereo track?
Sound Forge Pro 10 does not support multitrack editing or mastering. You would need to use a program like Vegas Pro 9 or ACID Pro 7.0 to work with multitrack files. However, if what you mean is multichannel (that is, one file with multiple channels), then yes you can use the Channel Converter process to convert the file into one with as many channels as you want.