Hi John van Wezel,

You can use the Import style feature to create two invoice templates in QuickBooks Online (QBO). However, you can only use one email address for both templates, same goes for footer text. Let me provide you a few information about this.

Let's make sure to indicate the text so you can map your data when creating a template. To do this, mark your data with opening and closing angle brackets. 

Here's an article for your visual guide: Import Custom Form Styles For Invoices Or Estimates.

Also, you can manually enter the other email address when customizing an invoice: Customize Your Invoices, Estimates, And Sales Receipts in QuickBooks Online.

Reach out to us if you have any other concerns. I'll be right here to help.