Thank you for reaching back to the Community. Deleting your employee's deduction in QuickBooks Payroll Core needs to be done individually. I'll show you how to do it:
For more detailed information, you can check out this article: Change or delete a payroll deduction item.
That's it! Please let me know how it goes. I want to ensure everything has been taking care of. Or if you have any other questions about QuickBooks Payroll let me know, I'm just a post away. Have a great day, and take care!