How do you convert Reg Sounds to 3d sounds???

With triggers I actually made a system to make the sounds seem 3d, but the problem is that I have to import each sound 3 times so they can play at the same time. Now if I'm not mistaken, 3d sounds only need to be imported once and are multi-instancable right? So I just want to know how I can go about making my sounds be 3d sounds and what is neccesary for this.

Umm it's a little hard to understand you but I think this will fix it:
Go to sound editor, right click it and press "use as sound" (or something like that) then double click the sound on the right column and check the box "use as 3d sound" then set it's minium distance (default is 600).