How to allow any "logged in user except external users" to create a project in a group?

Hello,
I’m gitlab Self-managed administrator.

I didn’t manage to authorize any “logged in user except external users” to create a project in a group (I don’t want they could create subgroup too)

How can I do this, plz?

ie.

  • linux-desktop group namespace (forbidden to create projects and sub groups for all except maintainer/owner)
    • ansible subgroup namespace (allow “logged in user except external users” to create a project, but not sub groups)
    • scripts subgroup namespace (allow “logged in user except external users” to create a project and sub groups)

Thxs
Pascal