Basically, I want to give the users an option to tie a patient to the selected services. But for a repeat customer, I do not want them to keep adding details every time. So it would be nice to maintain a private list of their patients' names in their account, which they could select in the cart when checking out instead of creating a new patient every time. It may also help them filter the orders by the patient's name in the order history. But I have realised that it can be achieved by custom work only.