You can move players around by changing their TEAM and CASH_TEAM in players.dbf according to the
Team IDs. Make sure that no two players on the same team share the same ROSTERPOS value otherwise there'll be lineup glitches.
The ROSTERPOS values are as follows:
0: Starting Centre
1: Starting Power Forward
2: Starting Small Forward
3: Starting Shooting Guard
4: Starting Point Guard
5: Sixth Man
6: Seventh Man
7: Eighth Man
8: Ninth Man
9: Tenth Man
10: Eleventh Man
11: Twelfth Man
12: Inactive 1
13: Inactive 2
14: Inactive 3