Resit is granting a participant the opportunity to repeat their MCQ or CASTest Retest on a future course or a specific
limited course for this purpose.

You can follow the same steps on the link below on how to add participants to a course to add the resit candidate:

As soon as you add the Resit candidate, the status will be changed into Yes under "Seat spent" as you do not need to pay for a Seat again.