There are 2 team files:
All Bulls.TMM and All Lakers.TMM
You need to place both files in your SAVES folder typically located:
C:\Users\Your Name\AppData\Roaming\2K Sports\NBA 2K12\Saves
Then run NBA 2k12 load the roster you want the teams located in, then load the teams.
Enjoy - share/distribute/edit as you would like.
Bulls Roster
PG-Derrick Rose
SG-Michael Jordan
SF-Scottie Pippen
PF-Dennis Rodman
C-Artis Gilmore
6-Horace Grant
7-Bob Love
8-Chet Walker
9-Jerry Sloan
10-Toni Kukoc
11-Norm Van Lier
12-John Paxson
IR-BJ Armstrong
IR-Bill Cartwright
IR-Steve Kerr
Lakers Roster
PG-Magic Johnson
SG-Kobe Bryant
SF-Elgin Baylor
PF-Kareem Abdul-Jabbar
C-Wilt Chamberlain
6-Shaq O'Neal
7-Jerry West
8-James Worthy
9-Pau Gasol
10-Gail Goodrich
11-Michael Cooper
12-AC Green
IR-Byron Scott
IR-Kurt Rambis
IR-OPEN