Duplicating your employees to easily pay them in multiple states is a breeze in QuickBooks Desktop (QBDT), @Accountant1233. I'm happy to share with you the steps on how to get this done right away. 

Thanks for providing details of your concern. To ensure you'll be able to achieve your goal, let me first discuss details about the process.

In QBDT, you'll receive the warning message "Another employee (employee's name), already has the Social Security Number XXXXXXXXX. Do you want to save this employee with the same Social Security Number?" once the system detects a duplicated SSN. To resolve this, you simply have to select the Yes button to let the program add that name with the same info from the previously entered employee. 

For reference, feel free to visit this article: Get started with QuickBooks Desktop Payroll.

Once everything is fine, you can check this link for additional guidance in paying your employee: Create and run your payroll.

I'm always around here in the Community to help with any of your payroll concerns. Also, I'd love to know updates on how the steps work for you. Please don't hesitate to add a reply below. Have a good one and take care always.