I'm not clear on which method you're using. It sounds like you've imported an swf with the actual "import" function in the GUI. I don't think that's what you were intending.
I use loaded movies a lot. Look at the contact form on my site
http://www.nsfilms.com
If that IS what you're looking to do then this is what you need to do.
CREATE and empty movieclip in your main movie. Name it loader1
In the button's action that triggers the loaded movie put this:
on(press){
loader1.loadMovie("nameoffile.swf");
}