To associate Billing Type Codes to Billing Categories, use the Billing Type Attributes
window. The seeded Billing Categories include Material, Labor, and Expense. Only the Billing Types associated with a Billing Category in this window appear in the Billing Type Name List of Values in the Service Activities and Billing Types form. Similarly only the Billing Type Names associated here appear in the List of Values for Billing Type: Material, Labor, and Expense in the Repair Types form.

You cannot associate the Billing Category Labor to a new Billing Type. The seeded Labor Billing Type is mapped to the Labor Billing Category.

Use the following path to navigate to the Billing Type Attributes window:

Switch responsibilities to Customer Support, Vision Operations and navigate to Setup > Charges > Billing Type Attributes.