The "New Trip" page gives you the option to enter multiple flight and hotel legs for your multi-destination trip. Simply select the "multi-destination" tab within the flight section of your Price to Beat page, and (depending on your company's policy set up within Rocketrip) you'll be able to enter up to twelve different locations for a single trip. You can also add hotels by clicking "Add a hotel" below the hotel Price to Beat options.
To see this in action, log in and set a Price to Beat for your next business trip.