I have found a work around. There are a few more concerns I have as of now, but they are not major at all. Everything that needs to be working is working 🙂 Thank you for the reply though @PitaJ.
I would like to have a parent group which automatically collects all users from sub or child groups. E.g. all member of group A, B and C should be members of group D without assigning them to group D manually.
Is there any possibility to realize this?
Thank you for your help and ideas!