Hey there, FTR.

Thanks for sharing to us the workaround steps you’ve done for the line numbers to show on the template. This information will also help other customers who are encountering the same issue.

As mentioned by my colleagues, you’ll have to manually add a number column for this information to show on the sales template. You may also want to consider using a third-party application to help you automatically add the line number on your invoices.

We’re unable to provide recommendations on which app to use, but I suggest visiting the Marketplace to find one that will suit your business needs.

I will send this product suggestion on your behalf, that way our Product Development Team will receive multiple suggestions of how beneficial this feature would be. To help you stay current with the latest news, and product enhancement, feel free to visit this link: QuickBooks Blog.

This information should help you moving forward.

If there’s anything else that I can help you with, click on the Reply button and enter your comment. I'll jump right back in to assist you further.