Which type of Sales Order bills the customer at intervals according to fulfillment progress?

The type of Sales Order that bills the customer at intervals according to fulfillment progress is known as Progress Billing. This method is specifically designed for situations where a project or service is completed in phases or stages. In Progress Billing, invoices are generated based on the percentage of work completed or the fulfillment milestones reached, allowing for partial payments throughout the project's duration.

This approach is particularly useful in industries such as construction or project management, where the entirety of the service or product may take time to deliver. By enabling billing at various points rather than requiring full payment upfront or upon final completion, Progress Billing provides flexibility and can improve cash flow for businesses.

In contrast, standard sales orders for cash sales and invoices typically require payment either upfront or upon completion, thus not accommodating the unique billing needs presented by projects that are executed in phases. The completed sales order also does not provide for interval billing, as it reflects a transaction where the product or service is fully delivered and billed in total.