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That is not an option in QBO
Thanks for posting to the Community, @jerrys-package-s.
@Rustler is right. You can visit our QuickBooks Apps to check for an application that can help you add QR code to your invoice.
This video article about adding inventory products and how to keep track of what sells can help you: Set up and track your inventory.
You can always leave a message to this post if you need further assistance. I'll be happy to help you. Take care!