Hi there, sale,

The option to edit or change the template of your purchase order (PO) is not available in QuickBooks Online (QBO) Plus and other versions of QuickBooks.

QBO only lets you personalize invoices, estimates, and sales receipts. The only thing you can do in your PO is add custom fields, customize the transaction number, and enter a default message on the form.

Let me show you how to do it:

1. Click the Gear icon, then select Account and Settings.
   
   
2. Go to the Expenses tab.
3. Click the pencil (edit) icon on the Purchase orders row.
4. Select the boxes for your fields and custom transaction numbers.
5. Enter your message on the Default message on purchase orders box.
   
6. Click Save, then Done.

To learn more about how purchase order works in the system, check out the Create purchase orders article for additional information.

Let me know if you need anything else, and I'm always right here to help you out.