Need help with workflow for nested repeating groups

I have a repeating group. The “thing” it repeats on has a yes/no list. I display the yes/no list with a sub repeating group as check boxes.

That all works fine.

My problem is writing a workflow that changes that element in the list when ist checkbox changes value. Im totally stopped on how to access the sub groups current checkbox’s list position to update it? My layout is below for reference.

Im thinking maybe I need to rebuild the whole list every time a checkbox changes, but I cant seem to access the current cell of the outer repeating group from a on checkbox change work group?

image

Figured it out. The inner repeating group needs to be inside a group which itself is in the outer repeating group

Can you clarify/illustrate how that is set up?