A simple and effective plugin for globally setting a players groups in a single command!
There is only one permission node setrankvault.cmd which allows you to use the vrank playername groupname command.
It is possible to set multiple groups by using this command too!
How do I set a player to my admin group?
/vrank playername admin
How do I set a player to my builder and donator groups?
/vrank playername builder donator