Open the Rooms and rates tab and select grouping By rates.
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Find the required rate and click on the ellipsis to the right of its name.
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Click on Open rate in the menu that appears — a settings page will be displayed.
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Click on the Rooms section and then Attach a room.
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Select the required room or rooms.
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Tick Attach rooms to all dependent rates if required, so that special offers of the selected rate also apply to this room. If you don’t need to link special offers then remove the tick.

Click on Save.