I appreciate you for sharing your thoughts with us here in the Community, John738. 

We're always looking for ways we can make QuickBooks Online (QBO) better for all users. I can see how beneficial being able to add lines when creating invoices and estimates. However, this feature is not yet an option in QBO.

Moreover, you can personalize your sales forms and add important information that matters to your business. QBO has the tool to create attractive, professional-looking invoices, estimates, and sales receipts. For the step-by-step guide on how to create and upload your templates, kindly refer to this article: Customize invoices, estimates, and sales receipts in QuickBooks Online.

Furthermore, here's an article that'll guide you on how to manage your QBO account and employees: Get set up for success. It contains topics and subtopics about inventory, payments, direct deposit, advanced accounting, and banking to name a few.

Additionally, I'd encourage visiting our blog for updates on our latest news and upgrades, including product improvements: QuickBooks Online Blog. It contains related and popular articles about QuickBooks.

Please know that you're always welcome to leave a comment below if you have other concerns. I'm just around to help.