Hello there, @joe445.

Printing check with split in QuickBooks Online includes only details such as the date, description, and total amount. It doesn't include the split information.

If you want to have a pre-printed customized check, you can visit our Intuit QuickBooks Checks and Supplies Team for the best compatibility. QuickBooks Online also has the option for you to align your checks when printing. 

Should you need any further information, please do not hesitate to comment below. Stay safe.