Well it may be fairly simple if you don't have some special groups already in there for reasons other than post count.
In my case I have some groups designated to private forums for specific groups. Not by post count.
But each group does not have access to the other groups forums.
But has normal group rights to the regular public forums.
I had to fat finger them in and I don't want to do it again. It took forever.
Your suggestion will work but it would be very cumbersome for my case as I would need to break it into several processes.
In fact I am doing that now.
Then hope I did not hose a member for access or worse add permissions to another groups forums.Which I have done a few times already due to operator error on my part creating the new group and selecting the wrong permissions.
It just evolved into a complicated mess.
Where all I want to do is add a 2nd level regular users group that allows larger file attachments and gallery files. Including some of the same people that are in the other special groups but only in the public forums.
I think I am dizzy now trying to explain this example.
But anyway it would be simpler to have a rebuild tool when you are like me and make a mistake on permissions than going through it all over again.
Then the bottom line is the changes don't take effect until the member makes another post. Or go through the member management panel again.
