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Hello there, mar0441.
I'm here to ensure you're able to include your invoice numbers in printing your checks. This way, you'll be able to track your payment information in your QuickBooks Online (QBO) account.
You can manually enter the invoice number in your check's Memo field. This way, it'll reflect in your checks when printing them.
I've attached screenshots below that show the fourth to seventh steps.
If you wish to personalize your sales forms and add information about your business, you can check out this article for detailed information: Customize invoices, estimates, and sales receipts in QuickBooks Online. It also contains information on how to change your data field labels.
Please let me know if you have other concerns. I'm just around to help.