Yes, you can add more invoice templates to your QBO company. You can also make one the default or use other templates as you create an invoice. I will guide you through the steps.
Creating a new template:
Go to the Gear icon and choose Custom form styles.
Click New style and select Invoice.
Edit the Design, the Content, and the Email options.
Set the new template as default:
Although you can set up a default template, you can still select your other available templates for a particular transaction. To do this, you'll want to click Customise at the bottom of the invoice transaction page and select the one you want to use.