Hello, hemefo, you can create a custom.ini look here: http://singularlabs.com/kb/add-your-own-routines-with-custom-ini/
Your definitions will be placed at the end of winapp2.ini so you can add a comments in custom.ini to separated it. Example for comment:
;===Begin of my custom definitions
[My definition]
;===End of my custom definitions
Good luck 🙂