Big challenge: protect multiple sheets AND enable outlining AND enable insert comment

"Dear experts, I've a big challenge. What I need is a VBA code for the excel file attached, that does:

- protect all sheets at once with a password
- enables outlining (grouping, + and -) on all sheets
- allows users to insert comments in protected and unprotected cells

I've already tried lots of things in the VBA, and always one of the above requirements worked, but I can't manage to get all of them work, and I didn't find someone with the same problem/solution on the forums.

If there is one of you that can give me required VBA code, I would appreciate that greatly!"