If you are hosting an event where a guest may want to register for multiple tickets, you can turn on Group Registration from your event.
You can turn on Group Registration from the Manage Event > Registration tab. You can see the button below in purple.
When a guest registers, they'll be able to select how many tickets they'd like to register for before checking out.
You can limit the number of tickets of each type that you'd like to sell as long as when the tickets are available for registration.