Easiest method is to add the sound to your library and then
drag and drop it on your stage. As long as there are as many frames
as the long as the duration of the sound, then you'll see it in the
timeline represented by a wave form.
If you're looking to load it dynamically, you'll need to look
into attachSound or loadSound. Try looking up sound in the help
file and you'll find plenty of examples in the Learning