You can also import teams, and if you want delete teh players you dont want. follow the 1st SS for mass delete.
1. Go to League Option & Rules.
2. Edit League Structure
3. Import Historical Team
4. Point to the historical_database.odb or master.cvs i always use odb
4. select yr, refresh list, lets say 1985 White Sox
5. import team
Now youi can also import an entire season by going to League Option & Rules..add league...create historical league. say 2000. So now you have 2 leagues your 2011 quickstart and your 2000 league + Harold Baines + 1985 White Sox.
Now to add them all to 1 league Go back to edit league structure from whichever league you want to bring the teams from.
Say you want 2011 NL east, 2000 AL Central, 1945 NL 1969 AL East ( but not the duplicate teams. You can remove teams or move them as you see fit.
Easiest way is to start the All time quickstart from the OOTP 12 loading page. and then add the historical players
And once again since you failed to notice it the 1st time
read this on how to import. I dont know if 12 has a manual yet, it did not last time i checked, the 1 for 11 is 99% the same.
http://www.ootpdevelopments.com/documentation/ootp11/?mact=Search%2Ccntnt01%2Cdosearch%2C0&cntnt01retur nid=500&cntnt01searchinput=import&submit=Submit