How do I create a zero duration service?

How do I create a zero duration service?

In Inspire, go to Setup > Setup Service > Setup Service
  1. Click + New
  2. Enter a Service Name 
  3. Click checkbox for Add On Service,
    1. Note: the service duration fields will be greyed out and un-editable. 
  4. Complete the remainder of the checkboxes and fields
  5. Click Save
Alert
Add On Services are 0 duration services are only available as Finishing Services for Online Booking. When scheduled, they will not appear on the calendar but will appear in the Appointment List underneath the Appointment Book.