You are about to report the tutorial shown below for review. Please only report if there is a problem with it.
Thanks.
How to use an external .swf as a library Adobe Flash / Tips and Tricks
I'm sure you already know that if you load an external .swf into your movie, you can then use actionscript in the main movie to attach movie clips in that movie's library IN THE LOADED LAYER ONLY.For instance, if I had a .swf called "myswf.swf" and it had a movie clip in it's library exported for actionscript and labeled "myMovie":