Odds for a Come Bet work the same way as the Odds for a Pass Line bet. Just like the Come Bet itself, the Odds are also betting that the Point its on will be rolled before a 7. If the Point is rolled, the Come Bet and the Odds win. If a 7 is rolled, your Come Bet and its Odds lose. You can only add Odds to a Come Bet after the Come Bet has moved to a Point and the Odds are not Contract meaning you can take them back at any time.