Maybe your event includes a promotional ticket that's only available for a limited time. Once the promotion is over, you'd like to remove the ticket from the registration page but allow the attendees who purchased it to keep their access.
You can control when a ticket is available or hidden by setting the active dates in your ticket settings.
In your dashboard navigate to the ticket page (Revenue > Tickets) and click (...) > Manage Ticket next to the ticket you'd like to hide.
In the Prices section, you'll see an option to set the "Available from" and "Available to" dates. When a ticket is active it is visible on your event's Tickets page and available for purchase.
Select Date range from the "Available from" drop-down menu
Enter the dates for which you'd like the ticket to be available. To hide the ticket immediately, simply set both options to past dates.
Keep in mind that these settings don't affect attendee access, so an attendee who purchases a ticket can continue to access the event after the ticket is no longer available.