If the treatments/services do not already exist in Halaxy, you need to set these up. You can add these in the following steps:
Click Finances > Fees.
Click New Fee at the top-right of the page.
Complete all the required information (if the patient is paying for the service rather then a third party, you can list the funder as private).
Under "Fee Visibility", set the fee to public so that it appears when patients make online bookings.
Click Save Fee.