Thanks for highlighting your concern about adding additional lines to your Invoice field in QuickBooks Online (QBO), Rikki.

We can click the parallel vertical dots on the left side of the first line item or click the Add or product or service option so you can add more.

Here's a screenshot for your visual reference.

If you still can't see the feature to add a line item, I suggest opening your QuickBooks account in a private window. This way, we can check if this is a browser-related issue. You can use either of these keyboard shortcuts depending on your browser:

• Safari: Control + Option + P
• Google Chrome: Press Ctrl + Shift + N
• Microsoft Edge: Ctrl + Shift + N

Additionally, you can check this article to learn more about personalizing and adding specific info to your sales forms: Customize invoices, estimates, and sales receipts in QuickBooks Online.

Don't hesitate to leave a reply below if you have additional questions about managing invoices in QuickBooks. I'm always here to help. Keep safe.