When viewing the booking click on the [Services] link in the left hand menu while on the booking screen.

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On the next page you will see the services currently added to the booking. You can schedule the service for a particular date and time by entering the required date/time into the input fields, you can also set a duration and assign the service to a staff member, and add notes.

If you need to delete the service you can do so by clicking on the red [X] button next to the service.