what you do is make some teams.....
after that go PS3 save menu on the XMB.....put a usb memory card into your PS3....go to BackBreaker save...click it...then choose custom team saves....and copy it to the USB....
take USB to you computer...and upload that PSV file..
the only problem is...I don't know if each person can do one at a time and then pick and choose....I'm think we might need one person to do everything.
or one person to do all the team rosters, then give that file to someone who is good at making logos and uniforms....and they make finish the custom teams...
then we can download one file.....
in the mean time we can play that other person's roster file.....