This allows you to include the contents of another file (called a "snippet") within your macro, as though the contents were part of the calling macro. You can access the Subroutines of the included file using /call, just as though they were a part of the original macro.
Traditionally the filename extension .inc is used to indicate that it is an include file, but you may use any extension name that you like. When you are including a file, you must make sure you type the name correctly. Include files are case-insensitive (eg. spells.inc = spellS.inc).
#include spell_routines.inc Sub Main /call Cast "Complete Healing" gem1 /return