I’d like to make 2 lists with “OA” and “25”, with their sublists but not with “OA” or “25” written in each first item of them. How can I do ?
Also, if I have OA, 25 and BC for example, I think this method doesn’t function ?
There’s no need to flatten your groups. The whole reason you have them grouped is to keep OA and 25 separate. This would work with as many groups as you’d need.
If you don’t need the identifier you can either remove it before grouping or after (if you want to double check that everything sorted correctly.)