Admission / Admission Settings / Online Reregistration / Basic Settings / Allow end users to select one of the following Academic Periods to be transferred to (Destination Period)
Here you define the academic periods that the end user can select to be transferred to. Typically, should be just the next academic period. However, there are academic institutes with multiple academic periods per calendar period. In this case the end user should be able to select where he/she wants to be transferred (e.g. Summer period and next academic period).
Setting -> 2020-2021, 2021-2022, 2022-2023
Example on the parent portal