Soundforge / Layering..

Hey,

I have recorded a mix through Soundforge, can I layer this mix on top of an intro track (.mp3) I have to spice up my intro? Is this possible with Soundforge..

I have my mix recorded through Soundforge & the output is .mp3, I open up an intro track (.mp3), can I get my recorded mix & layer it on top of the intro track in Soundforge, so that both the intro track plays while the mix plays also? Hope this type of layering can be done, I have been told it can but not sure how, hope someone can help..