Pass Issued Limits
Let's say you're running a sale on a pass and you only want to allow a certain number of people to have it. You can simply add a Issued Limit to any pass (new or existing). To limit the number of passes that can be issued/purchased, simply check the Issued Limit box when building or editing a pass.
In this example, it's stating that this pass can only be issued to 150 customers (includes comps).