Step-by-step explanation:
First you have to enable the purchase order feature. Here is the info on how to create them straight from the support article: Enabling purchase orders: Purchase orders are available in QuickBooks Online Plus and in our older QuickBooks Online Edit
Second You have to purchase and send your order
Step 3: Update the status of a purchase order and add it to a billWhen you create a purchase order, the status is Open. Once your vendor accepts the purchase order, you can add it to an expense or bill to make the transaction official.Follow these steps to add purchase orders to expenses or bills. QuickBooks automatically changes the status to Closed.
Step 4: See your open purchase ordersGo to Reports .Search for and run an Open Purchase Order List report, Open Purchase Order Detailreport, Purchases by Product/Service Detail report, or a Purchases by Vendor Detailreport.