Thanks for posting in the Community, jonjus10!
The message to customer is based on the current email message you have set regardless if you have created a new invoice template. If you need to have different messages for each customer type, you'll need to make the changes manually while you are creating the invoice.
I understand how helpful to your business to be able to set a default email message to each customer type. I would recommend sending a request in refining this experience further by providing feedback. To do so, please navigate to your QuickBooks online, and click the Gear Icon on the upper right and select Feedback.
Also, you can check these link for a comprehensive information about customising your sales forms in QuickBooks Online:
Feel free to post your concerns in the Community or click the Reply button for follow-up questions. We'll be happy to help. Have a great rest of the day!
