Possible to use a MC in another fla?

I was experimenting and trying some things in a new flash document (fla) and came up with a new navigation menu for my site. This little ‘experiment’ took about 3 hours to get it just how I wanted it and then when I had it done I realized it was in a flash document by itself and not part of my site (index.fla).

The whole nav menu/system is all contained in one movie clip (new_nav), is there a way to save this or export/import this one movie clip into my index.fla file so I can use it there?? There is quite a few movieclips inside this main movieclip (new_nav) so I would like it all to be intact if its possible.