EDIT: I looked back at the old Live 2000 posts, and found this post by Andrew:
I tried adding a rookie to the pool, just to make sure my advice/method is correct, and it is. Some important points to remember:
• Set ISGENERATE to True
• Although not necessary, you can change the player's ID to a value much greater than the last player in the database (ie. if the last created player's ID is 1035, set the player you are placing in the draft pool's ID to 2000).
• Set ORIGTEAM, TEAM and SALARYTEAM to 39.
• Remember to fill in all necessary player data fields - created players in Live 2000 by default do not have RANGE2 and DHARDY ratings. Also fill in rookie strengths/weaknesses, ROOKIERANK (projected draft position), etc.
• Leave all draft field values at 0.
Is this using the DB Commander 2000 Pro? How exactly do you do this?