One stadium, three teams?

If i want to put 3 (costume) teams in one stadium, how do i do it?
I want to have only one stadium file (****.viv) and have three teams playing in it, what should i change at "location.dbf" and "teams.dbf"?

like the eastern and the western allstarts - 2 teams, one arena.


if you put the same Stadium ID in more then one team (at team.dbf), it makes a mess at the stadium menu.
any ideas?

thanks.

anyone? this is very important...