So there's sort of a workaround for custom playbooks.
The form subs are formation specific, so any subs that you do in a coach's playbook will carry over to a custom playbook IF those formations are included. What I'm trying to figure out if there's a workaround by picking the formations you want ahead of time, then doing formation subs for each playbook that contains the formation you want to include in your custom, then after all that selecting your custom. Basically, if the subs stick for more than one playbook.