[Leo_The_Lip]

I have done this in the past and was happy with the results. Bear in mind this with OOTP6, so it might be different today.

1. Start the league with the league structures you want, including the minors structure (very important)

2. Release all the players at each level

3. Delete all the FAs. This should result in zero players on every team at every level.

4. Now if you want (for example) AA players at the top level, fill the AA rosters with fictional players.

5. Run the setup Organization button for each team. This should put all the AA quality players at the top level.

6. Repeat steps 4 and 5. This fillsup MLB and AAA for each team.

7. Now fillup AA, A and Rookie, and you are good to go.

Hope that's clear. It did work for me.

As the other posters' have pointed out, the incoming draftees will be your best players. Thus a Golden Age will begin. That's what I liked about it.

Good luck if you go this way.