An Add-on item is a service or product that does not have a duration and may or may not have a cost. For example, you can give clients the option to add aromatherapy oil or hot wax to their massage for an additional cost.
When setting up an Add-on, you'll select the Service(s) that the Add-on applies to. When a client selects a Service that has an eligible Add-on, they'll be taken to your Add-on Menu to choose from all of the Add-ons assigned to that Service. Add-ons cannot be sold individually by themselves during online booking.