I just added an agc file to my project to load my media from a separate source file and it seems the label cannot be found.

I thought gosub might be a "core" command but it's not in that section of the help files.

Is there a simple way to add more source files to a project or am I coding this wrong:

Have you included your file using the #include command? Some examples of this are in the General - IncludeFiles project along with Games - SpaceShooter and Games - SantasBadElf.

No I haven't. I guess I'm used to DBP doing all that for me