Thanks for getting back to this thread, @mricheson-riches. Let me chime in and provide further details about the import style option in QuickBooks Online.

The Import Styles feature was disabled Last July 1st. Any company that has not enabled Import Styles from QB Labs after 6/24/2021 will no longer be able to enable it. Any existing QBO companies with the feature are currently not affected and will continue to have access. In the future, there are plans to completely remove this feature from all QBO companies.

Alternatively, we still have some great templates you can make use of when customizing your invoice. You can utilize the footer options and used other spaces for things like signatures. Otherwise, you can look for 3rd party apps to create your own invoices templates. 

If you need further details, feel free to contact our support team once they are available. 

Additionally, let me attach this resource to help you personalize and add specific info to sales forms: Customize invoices, estimates, and sales receipts in QuickBooks Online.

Feel free to get back to us if you have other questions about import style in QuickBooks. I'll be around to help you again. Stay safe and take care.