It is possible to make tribe data, though I don’t know about the Tribe ID, and you can also add to tribes by getting the player state reference from the pawn, dragging off it and casting to shooterplayerstate, from there under the Helper section in the right-click menu there are a few tribe related nodes.
You would still be better off checking the SOTF files however to see how Wildcard have implemented these things.
-WM