Hi joseph30,
Welcome to Community! I can see how having the ability to add blank lines to the invoices would be beneficial, in providing a clear picture of your business from a professional standpoint. QuickBooks Online is a powerful program for managing your daily tasks with ease. I'd be happy to assist!
Currently, there's no in product feature for adding line breaks to your invoices. As an alternative, I suggest spacing your line items by adding a blank row between them. This will make the invoice cleaner and you'll see the result on the print/preview screen.
If you have any other questions, please feel free to reach back out. We'd be glad to help!
