Add, edit and delete a city tax
In the booking window, go to Services and then City/Accommodation Tax.
Use the Select city/accommodation tax ... button to add or overwrite the currently added tax with one you have previously created. You can also delete a tax you have added here.
Use the edit Actions button to call up the preferences window for the city/accommodation tax and edit the ones you have previously added.
If you edit a city tax that has already been added to one or more bookings, it will not automatically change within those bookings (except for where they are placed on the correspondence). If you've changed something (e.g. the amount of the tax) you will have to manually overwrite it in the bookings by re-selecting it from the menu.