Five types of items can be billed using the Service Billing module.
The last four types of items—labor, parts, expenses, and general—are used to specify time and materials for a one-time, non-recurring service, or job.
Billable Items vs. Billable Entries
For labor, parts, expenses, and general items, it's helpful to distinguish between billable items and billable entries. A billable item is a one-line description of a product or non-recurring service that can be billed to a customer. Billable entries are the actual amounts submitted for billing for a billable item. Billable entries are child records of billable items. For each billable item, multiple billable entries are allowed for labor and expenses, but not for parts.