When creating you course select the ‘Offer bulk discounts’ check box when adding your course details. This allows you to choose how many sessions booked by the same person in the same transaction qualify for a discount, and what percentage discount to apply. For example you could offer a 10% discount when someone books 3 sessions at the same time.
You can turn this feature on and off at any point during the course. To do this select the course you want to apply it to and select ‘Edit course’. Unselecting the ‘Offer bulk discounts’ check box will turn the discount off.