Hi,
You can load an swf movie inside a movie clip.
example:
First create the movie you want to display (any movie) when it reaches a certain frame.Name this file as MyMovie and save it on drive C:, Compile to produce the MyMovie.swf.
MyMovie.swf **this is the file we will display inside another swf.
Create a new flash file.Create a movieclip with instance name "swfloader". Place it on your flash stage, on the specific timeline. Example, you want the MyMovie to play when timeline is on frame 20.
on frame 20, add this script.
_root.swfloader.loadMovie("C:/MyMovie.swf");
_root.stop();
Note: You can load multiple external swf files in 1 movie. That's how most flash websites work.
Hope this helps.