How can I insert a line item in check detail?

I'd be glad to provide some info on adding line items in the check detail in QuickBooks Online (QBO), JMARTIN1. 

In QuickBooks Online (QBO), you can directly add a new line item within the check form. I'll show you how:

1. click on the +New in the top right corner. 

2. Choose Check under Vendor. This will open the form.

If you need further help printing multiple checks, here's how to add them to the print queue so you can print them in batches: How to reprint checks and sales forms.

For more information on how to apply multiple filters to customize your report and save them so you can run the same report in the future, check out this article: Customize reports in QuickBooks Online.

The Community always welcomes you for further inquiries with regard to QuickBooks-related concerns. Have a great day ahead!