Groups - Parent groups

Hi, I have managed to set up all of my shelly1s now, finally. Now I want to set up groups to have for example a master switch for all lights. I have read a lot here but cant figure it out. I want to stick to paper ui. Can anyone help??

I don’t use PaperUI (my disclaimer,:laughing:) but I think you can add your items to a group by entering the group name for each item in the Parent Groups section found in Configuration > Items