The battleship could simply be added to the existing CV group and used in addition to the cruiser. Or maybe it could be made the flagship of a new BB group with some extra fire power, AA defence and toughness to compensate for the lack of air power. I can't see it being employed independently like a PT boat though. From the POV of realism I'd prefer it if one player sat in a gunnery director and fired the whole primary armament but that seems unlikely.