#include

The #include command allows you to insert one file into another; when you do a Save And Play the file you specify with the #include command is inserted at that point. You can specify an absolute path or a relative path. If you use a relative path then the first include will be looked for relative to the path specified in the package settings, and subsequent paths will be looked for relative to the file which is including them. You may refer to the path specified in the package settings by starting it with !/. You may also start your path with ~/ to indicate a path from your user home folder (even on Windows).

For more info see this blog post