You can manually create a user on the system, which will allow you to book this user on multiple events.
This can be achieved by logging on to the system using your credentials and selecting "Delegates" tab from the navigation bar on the left and press the + icon on the top of the page.
The first step is to assign this user to a user type group, which you can also create and manage. This functionality allows you to sort out different groups of users based on criteria that you create.
The second step is a form that is based on the registration questions you have chosen and the custom questions you have created.
To add a delegate to an event or session, read the 'Booking a new user to an event' article.