The easiest way would be to alter an existing sound set. Have your sound files ready (like on your desktop), and goto an existing sound set in the sound editor and right click on a file and hit "replace internal sound." You'll be promted to load a file. When you load a file, it automatically uploads it to your import archive (it doesnt have to be in your loaded sounds column in the sound editor). Although the original sound you altered will still have the same name, when you play it in the sound editor or in game, it will be your loaded sound. If you mess up, simply delete your sound out of the import archive and the original sound you altered will revert back to normal. If theres is another way, i'm curious to know what it is, if anyone else has anything to add...