Call the stage from as file

Hi guys,

How to call the stage from as file. Actually, I need to access the mc which is in library.

One way of getting it is by adding it in the fla file and then sending to as file. Is there a way to get the mc directly from library to as file.

One more, Is there any way to access the variable declared in fla file from as file.

Any help would be better.
Thanks in advance,