Thank you for joining the thread, @PBusinessSolutions.

I’ll help you assign classes to later payroll in QuickBooks Online (QBO) Payroll.

To assign classes to your employees, we must access the Payroll Settings to make the necessary changes. I’ll show you how:

1. From the Gear icon at the top, choose Payroll Settings. 
2. This will open the Preferences page.
3. From there, navigate to the Company and Account section and click on Accounting.
4. Scroll down to the bottom and go to Classes.
5. Choose the option saying, I use different classes for different employees.
6. Click OK to proceed to the next page.
7. Scroll up and you will see the boxes where you can choose classes for each employee.
8. Once updated, click I use different classes for different employees to save the settings.

Also, if the payroll has been directly deposited, you'll have to contact our Payroll Support Team to make the changes for you. Otherwise, if it has been paid via paychecks, you’ll have to delete the paycheck and recreate them.

Furthermore, print your paychecks and pay stubs by checking out this article: Print paychecks and pay stubs in Online Payroll

Feel free to add a reply if you have more questions about assigning classes to your employees. I’ll get back to you as soon as I can. Have a good one!