The option to modify the Purchase Order Form is currently unavailable in QuickBooks Online (QBO).
QBO only allows you to personalise invoices, estimates, and sales receipts. In PO, your customisation options by adding custom fields, personalising the transaction number, and inserting a default message on the form.
Here's how:
Click the Gear icon, then select Accounting and Settings.
Go to the Expenses tab.
Click the pencil (edit) icon on the Purchaseorders row.
Select the boxes for your fields and customtransactionnumbers.
Enter your message on the Default message on purchase orders box.
Click Save, then Done.
To learn more about managing purchase orders in the system, read the Create Purchase Order article. It provides straightforward, step-by-step instructions to guide you through the process.