Yes if you go to the front desk and ask to set up a charge account, they will give a 'dummy' room acct number that you can charge to. Then have your or whatever, charge to the room and then close out the acct. I've never done this for a single meal, but have when I've been staying at a property on vacation where there is an adjoining marriott that doesn't have the accounts cross linked so I could charge there for the week.