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Thanks for reaching out to the Community, @brianansari.
Before going into detail, I want to ask if you mean how to delete a bill?
In QuickBooks Online, invoices are generally used for customers and bills are what you pay to vendors. I recommend paying the bill that's owed before deleting it.
For now, below are instructions with how to delete a bill:
For detailed info with deleting a bill, refer back to this article: How to delete a bill.
I look forward to chatting with you soon. Have a safe and productive rest of your day!