It is possible to sell the same items at the same sale conditions by clicking on the purchased item in the user's profile and then on Renewal
the first day of validity can be the day after the previous multipack expires or a date that can be chosen by the operator (select Free)
once you have clicked on OK to confirm the changes, you can edit the price (if needed) by clicking on the corresponding button.
To renew the enrolment onto a course, please refer to the dedicated manual: How to Renew and Enrolment.