Any transactions can be settled with journal entries, userrajiv-sahay.

When you say you want to settle an invoice, are you referring to an invoice that was paid successfully? If so, you can just use the Receive Payment function to close the invoice and record the payment. Here's a link for reference: Record invoice payments in QuickBooks Online.

If you're referring to an invoice that will no longer be paid, it is already considered as bad debt. With that said, we have ways to settle it without using a journal entry. You can find this article helpful regarding the process: Write off bad debt in QuickBooks Online.

If you're referring to a different way of settling the invoice, please provide us more information about it. We'll be right here to further assist you.