I have Kareem Abdul-Jabbar, Dejan Bodiroga and Walter Herrmann in an old roster o' mine. ¿How can I add 'em to the current roster?
Get a DBF editor, copy the players from the old roster's PLAYERS.DBF, and paste them into the new roster.
Be sure to assign new PlayerIDs (use the last sequential numbers), and change the original and current Team number to 29 (free agents) with a RosterPosition of 0.
For more info, search the site for AlexBoom's post on this.