Let's make sure you'll be able to insert rows in your invoice, BigFootProductions.

We have some ways on how you can insert rows on your invoice in QuickBooks Desktop. You can use keyboard shortcuts to insert a line on your forms. 

For QuickBooks Online, you can follow the steps provided by Angelyn_T on how to insert rows on your forms. This thread has already been posted over a year and I'm sure our product team has already been doing something for this to be made available. 

You can browse these help articles in case you need additional resources in QuickBooks. 

Reach out to us if you need further assistance about adding a row in your forms. I'll be right here to help.