I can shed a light on that, richmondsurveyin.

QuickBooks Online itself doesn't directly support printing checks on blank check stock. However, if you're using QBO Payroll,  you'll get the option to enable the Blank Check Stock Printing feature. Here's how to do it:
 

1. Go to the Gear icon, then choose Payroll Settings.

2. Under Preferences, select Paycheck Printing.
3. Select Blank check stock, then choose the appropriate printing method.
4. Set the number of copies and choose whether you want to print your phone number in the employee's pay stub.
5. Select OK.
6. Enter your company's bank information. If you set up for e-services/direct deposit, we'll use the same bank information.

Feel free to visit this page to learn more about this topic: Print checks on blank check stock. When you're ready, I recommend reading these articles to be guided in printing the checks and configuring your print settings:
 

• Print or reprint paychecks and pay stubs
• Set up print settings for printing checks

You can always find me here if you need a hand in completing your other tasks. I'd be glad to assist you again.