Can we Import different sound files?

I have a guitarist friend and we're working together on some of the scores that I come up with. I find that working with MS on guitar sounds very difficult. I can't seem to get the feel or sound that I want. And to get a solid strumming seems to be an art form.

IF......my friend sends me a .wav file can I import it and somehow mix that in with what I'm working on?

If that doesn't work what options are available to blend songs or get a more genuine guitar sound?

Thanks MS
TAS