When I duplicate an invoice with several line items, a new invoice is created, but only includes the first line item. Some of my invoices have 5-6 invoices each.

You’ll want to contact our Live Support team for further assistance with the invoice that only creates the first line item, tammy130.

Since you have already tried duplicating different invoices and the issue persists, I recommend reaching out to our Live Support team. They can look into the problem securely and provide additional troubleshooting steps to resolve it.

Here's how:

1. In your QuickBooks account, click the (?) Help icon in the top right corner of your screen.
2. Next, go to the Search tab and enter a keyword to activate the Contact Us button.
3. Then, click the Contact Us button.
4. Once done, select how you want to connect with our experts.

In the meantime, you can create the invoice by entering the products and services manually. For more details, refer to this article: Create invoices in QuickBooks Self-Employed.

If you have any further questions about your invoice in QBSE, please reply below. I’m here to help.