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Yes, you can change the email address you have on a purchase order (PO) in QuickBooks Online (QBO).
If you haven't sent out the PO yet, you can directly edit the information that appears on the Email text box. Otherwise, you'll have to locate the specific PO and edit the email address from there.
You can also refer to this article: How to add a preferred vendor and create a purchase order using that preferred vendor. Learn about other ways you can use the PO in QBO.
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