Note: This menu item will be visible if the tariff configuration mode is set to Normal. If the tariff configuration mode is set to Advanced or Micromanage, you`ll see two separate menu items instead, one pointing to Tariffs, the other to Rooms.
Depending on the Tariff Configuration Mode you are using you'll either see Tariffs and Rooms in the menu, or two separate links, one pointing to Tariffs, the other to Rooms. If you're using Normal editing mode it's the former. If it's Advanced or Micromanage it's the latter.