In QuickBooks Online (QBO), you can only add two garnishments under the employee details, @atlanticcoastland1. However, you can set up the additional garnishment as Other deduction.
Here's how:
- Go to the Payroll menu, then Employees.
- Select the employee.
- From the Deductions & contributions section, click Edit.
- Select + Add deduction/contribution from the Deduction/contribution dropdown.
- From the Deduction/contribution type, select Other Deduction.
- From Type, select Other after tax deductions.
- Enter other needed details.
- Click Save and Done.

You can refer to these articles for more details:
Also, you can run the Payroll Deductions/Contributions report if you need to keep track of your total employee deductions and company contributions in QBO. Here's an article for further guidance: Run payroll reports. It includes several payroll reports you can use to view details about your business and employees.
On top of that, consider exploring our QuickBooks Live Expert Assisted service, which offers expert guidance and valuable insights to optimize payroll and tax processing operations.
Let us know in the comments if you have any other concerns regarding payroll, taxes, and forms. It's our priority to ensure your success.