Go to Booking →settings → frequencies

Click on new Frequency

Give the frequency a name

Set it as active

Select the type of discount the frequency will have, fixed amount or percentage

Set the price or percentage

Mark this frequency as default if applicable

Select the display order

Choose a time interval

Select the services associated with the frequency
Click create

Go to Booking →settings → frequencies

Select a frequency and click on the edit icon

Edit what you must and click update

Go to Booking →settings → frequencies

Select a frequency and click on the delete icon

Go to Booking →settings → frequencies

Select a frequency and click on the edit icon

In the section "Choose Services" Add or remove the service(s) you want this particular frequency to have.

This is useful when you want only certain services to have a specific frequency discount.