Thanks for getting in touch with the Community, anne15.

If you're using your new invoicing layout, there isn't currently an ability to add extra blank line items and have them appear on the PDF copy of your document after saving it. You can add extra blank line items, however after you save the invoice, QuickBooks won't include them in the PDF.

Here's an image showing my experience in our test drive account:
 

I can certainly understand how such an ability could be useful and have submitted a suggestion about it as of today. You can also submit your own feature requests while signed in.

Here's how:

1. Use the Gear icon, then go to Feedback.
2. Enter your suggestion(s) in the Have feedback? window.
3. If necessary, attach a file with your Camera icon.
4. Select Next.
   
   

Your feedback's definitely valuable to Intuit. It will be reviewed by our Product Development team and considered in future updates. You can stay up-to-date with the latest news about your product by reviewing Intuit's Product Updates webpage.

You also have the option of checking our QuickBooks App Store for apps which may be able to help you achieve what you're looking to accomplish.

In the event you're still using your old invoicing experience, you can add blank line items to create spaces on the PDF copy when saved:
 

I've also included a couple detailed resources about working with invoices which may come in handy moving forward:
 

• Create & manage invoices
• See what’s new with invoices

Please feel welcome to send a reply if there's any additional questions. Have a wonderful Thursday!