User blog comment:OMega Hybrid/Multiple saves/@comment-165.127.8.254-20120523131132/@comment-23878607-20140831151322

You create multiple PSNs and sign up for online use. There is no need to pay for a PSN membership for the extra accounts, since you only need a separate email address to get online access and it only requires internet access to use the online features of this game.

That applies to Xbox, as well.