Limiting # of subgroups
Is there a way to have a limited # of subgroups in a hierarchy?
So for example, if the site admin want to create a max of 3 subgroups, they would create the following hierarchy:
(Parent) Country -> (Subgroup) State -> (Subgroup) City
Then members are only able to create ONE additional subgroup below the City.
Is this at all possible? If so what would I need to change in the code?
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