1. In the reservation, edit-mode click the options menu in top right corner.
2. Select 'Change Rate Option' this will open a panel to the left on the screen.
3. Select the Rate option you want to add in the dropdown and select the rooms you want to apply the Rate option to. Click Apply.
4. The panel will close, and you can see the rate options added to the selected rooms.
Please note that adding or changing a Rate Option in an existing reservation will not change the price for the room.
5. Click 'Save' in top right corner of the reservation to save your changes.