1. Go to the sales order.
  2. On the left side under tasks, click Refund order.
  3. Under Payment Details, click on the Refund method and change this to Other in the dropdown.
  4. Click Refund.
  5. Go to the event, Registrations tab.
  6. Click Add and add a registration for this person.
  7. Click Add Payment.
  8. Enter the payment method as Other (same as the refund method) and save the payment for the event registration.
If you do not see the payment method other in the sales screen, add the payment method to the sales method.