You probably see the power in SWC libraries, or used #include "file.as", but you just don't know the modules in the Adobe Flash library, here's what you need for this:

1) create a .fla file

2) add an empty MovieClip to it, write in Indetifer the name of the class that will be used in the module

3) write a class for it, create several functions

4) create the main .fla file where the module will be used

5) create a clip with these settings

6) add to the scene (can be in _root)

7) now you have a class that works as a module and can work with the environment, for example, change Misha’s cursor to another in the entire game, modules can work between each other

Now you can create modules, they will serve you well