How do I create a single booking that will allow me to book multiple types of tickets together?

A feature of Event Registrations is that you can make them Options Only. This provides the ability to have a single booking that will allow you to book multiple types of tickets together.

When you Create an Event Registration and check the Options Only box, the booker will not be able to select a number of attendees to the registration but will be required to select at least one option and a number of attendees to each option selected.

Notes on Option Only:

• If you select Options Only, the price of the Registration will automatically default to $0. Each of the options will have a separate price.
• The booker can "cherry-pick" the options that they wish to book. 
• You cannot have any further Options below the Options Only options.

See How do I Add an Option to a Registration Type?