Hello!
I have the next problem : i have 2 custom modules - School groups and Teachers. The relationship of these modules is many-to-many. So when i go to detail view of some school group i choose in subpanel the teacher(s) of this group. But i also need to see this information about teachers in some field of group card in detail view and listview. How can i do it? I’ve read about logic hooks and some method changing views/view.details,php, but it turned out that custom modules don’t have this folder. I’m confused and need to do it as soon as possible. Help me please! Thanks 
You can just add the missing views and any files you need yourself to the modules in the custom folder.
Thanks for answer! But which structure should i use to add?