A pass type is a list of guests you link to events, so that its pass holders are on the guest list at every one of them. Create a pass type for members, staff or season ticket holders, then add passes to it (see Add or import passes).
To create a pass type, you need the Admin permission on the account. Learn more about Permissions.
NotePasses: available on the Professional plan.
You're then taken to your new pass type, where you can start adding passes.