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I'm here to take care of your query regarding packing slips in QuickBooks Online (QBO).
Follow the steps below on how you can generate and print a packing slip:
Highlight the Sales tab.
Choose the correct customer in question.
From the Transaction List tab, tick the box next to each invoice or sales receipt for which you want to print a packing slip.
Go to the Batch actions drop-down menu, then select Print packing slip.
In case you'd like to generate statements, see this article: Create and view customer statements. You'll find a list of common questions about statements at the bottom of the page, along with their answers.
I'll be around in case you have other questions. Place them in the comments below, and I'll be sure to get back to you.