It's not difficult to do what you wish to.
Start an historical league in the year you want. In league setup, edit league structure, move the ML Teams you want to keep into one division. Delete the rest if you don't want them all (players will go to FA pool from deleted teams)
Now add another division and the amount of fictional teams you want. Then name them. You can go to each teams page and fill their rosters with fictional players if you wish.
Questions?
