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We can look for a third-party app, bayhealthrx-gmai.
You can check the Apps available to sync your POS with QuickBooks Online. Here's how:
Alternatively, you can also enter your sales as a sales receipt:
Check out this article on customizing sales form in QuickBooks Online for future reference: Customize invoices, estimates, and sales receipts in QuickBooks Online.
Let me know if you have other questions about how QuickBooks Online works.
Which POS system do you have? You may need a connector.
Another option, you may prepare the Sales Receipt data in XLS format
then utilize an importer tool