In a staff profile go to their Preferences tab.
Scroll down to the Hotlinks section and select Yes to enable it.
Next enter the product numbers you want to be listed as the top 10 most used services that you would like to enter for that staff member to use on the appointment booking page in the hotlinks list and select Save.
Now go to the Schedule to schedule an appointment.
In the product & service section you will see the hotlinks link.
Click on the Hotlinks and you will see the list of items to select from.
Select one of the items and it will populate into the item field.