Thanks for joining our Community! There are times when days get busy and things like this happen. QuickBooks Online understands these situations and provides exactly what you need to correct the issue and get back to what you love. I'd be happy to guide you!
Here's how to re-create the invoice:
1. Hit + New from the left menu and then choose Invoice
2. Using the Customer ▼ dropdown, select the customer
3. Review the Invoice date and select the Terms ▼ dropdown for the due date.
4. Choose the product or service, enter a quantity and applicable sales tax
5. When you're ready to send the invoice, select Save and send