Welcome to the Community forum, JYdens.
QuickBooks Enterprise 24.0 release R9 now allows you to connect sales orders to purchase orders, making it easier to fulfill customer orders quickly and keep track of purchased products more effectively. Based on your verbatim, it seems you're looking to link a previous purchase order to a sales order. However, it's not possible to link a purchase order to a sales order directly, as you need to create the sales order first and then link it to the purchase order.
If you're interested in learning about linking sales orders to purchase orders, you can check out this article for a detailed explanation: Link Sales Orders to Purchase Orders in QuickBooks Desktop Enterprise.
If you have any more questions, feel free to ask in the comments below. We're here to assist you!