1. Open your event's dashboard and click on "Registrations". 2. Then click on the Settings icon. 3. Enable the "Allow ticket upgrades" checkbox. 4. Click on "Save settings" to save the changes. Related ArticlesHow to delete tickets in bulkHow to show different fields to the attendees in the registration form based on their ticket selection?How to create add-ons that the attendee can purchase?How to Enable Pass Application Fee to Customer in NunifyHow to setup Auto-Waitlisting of Tickets?