How do I add a po number to an invoice?

Hi there, 

Thanks for joining us here in the Community. I'm happy you're reaching out for help with your question regarding adding a PO (purchase order) number on your invoice. 

QuickBooks Online is here to help you customize your business experience by allowing you to add custom fields to your sales forms. These fields can be used for anything you'd like, and adding a PO number field is a great idea. 

This article will guide you through the steps on how to add a custom field to your invoices: How to add custom fields to invoices. It's important to note that this option is available in QuickBooks Online Plus and Essentials subscriptions at this time. You can add custom fields to invoices, sales receipts, refund receipts, and credit memos. 

I hope this helps you reach your goal today. If you have any other questions about that, let me know in the comments below. 

Have a great week!