NBB Customer Contact Class And Types
Create a Non-Billed Budget customer contact class. The contact class may include the following customer contact types:
Non-Billed Budget Activate
Non-Billed Budget Renewal
Non-Billed Budget Stop
Note: 
Customer Contact Letters. If you want to send letters to your customers when a contact of any of these types is created, you must create an appropriate letter template and attach it to the contact type.