Hi there, steven-bryan.
In QuickBooks Online (QBO), there is no Split option on an invoice. What you can do is split the invoice into classes which can be done by enabling the Class tracking feature.
You can read through this article which contains additional information about Class Trackings: How to Set Up and Use Class and Location Tracking.
I'm also adding our easy-to-access articles, webinars, and video tutorials that will help you in familiarizing the different tasks, features, and functions of QBO:
Get back to me if you have other questions. I'm always happy to help you further. Keep safe and have a great rest of the day!
If you meant something else, may I know what specific task are you trying to achieve with invoices?
I'd appreciate any additional information and I'll take it from there. Have a good one.
