I understand how you feel about this situation, @sandyrolt. Rest assured, I'm here to guide you on how to manage this. Inserting a row between items in an invoice is possible by dragging an empty row line in between the items. However, arrow key navigation isn't available. I'll guide you on how to achieve this.

Here's how:

1. Edit the Invoice duplicate.
2. Select Add lines.
3. Drag the empty line between the items by dragging the nine dots button.

That's the best way to create a separation between line items. However, if you save or print the invoice, QuickBooks will automatically eliminate empty lines. For this separation line not to be eliminated, you'll need to add a description with any text in it. A negative symbol is the best option.

In the future, you can check out this article to learn how to print multiple sales forms in QuickBooks Online.

Let me know if you have other concerns about managing invoices. I'd be glad to help you anytime.