Which action allows you to convert an estimate into a purchase order in QuickBooks?

The option that allows you to convert an estimate into a purchase order in QuickBooks is to copy the estimate directly to a vendor purchase order. This process is specifically designed for scenarios where a business needs to procure materials or services based on the estimates created.

When you select the option to copy the estimate, QuickBooks facilitates the transfer of relevant details such as item descriptions, quantities, and pricing directly into the purchase order format applied to a specific vendor. This streamlines the workflow, allowing users to efficiently manage their purchasing activities based on previously generated estimates without the need for manual data entry, helping to reduce errors and save time.

In contrast, the other options involve actions related to billing or invoicing and do not serve the purpose of converting an estimate into a purchase order directly. This makes them unsuitable for the task specified in the question.