How can I set a special discount for a group registration?

You don’t need to use discount codes to sell group tickets/seats at a more favorable price than individual tickets. Instead, go to the Tickets / Groups menu and create a new ticket/group for group registration. If you intend to offer a Valentine discount for couples, set the parameters to “2” in minimum and maximum number of submitted attendees checkboxes. Assign a lower unit price accordingly. In this way, you will force the registrant to provide data for two attendees and to charge a double but more favorable fee than two individual registrations.

Similarly, if you intend to offer more favorable ticket purchase conditions for groups, set the minimum group size and assign the appropriate price.