Is there a good pratice to restrict access for different type/group of user?

Hello. Say I have a forum with 4 different forums.
example. City A, City B, City C, City D.
I want to restrict only the user who lives in City A, can visit the City A forum.
who live in City B can visit the City B forum and so on.

In this case. Should create different user roles. So I can Forum Permissions feature to control the access.

I expect there will be more than 100+ cities. Concern if it does any harm if I create 100+ user roles…

And as for this method, it is very different to be managed/ or to add a new user role by the non-tech admin user.

Or there is a better way?

Thanks

• This topic was modified 19 hours, 45 minutes ago by theblueli.