You can add the catch-up provision for the 401(k) to your employee over 50 years old by setting up in their employee's profile, Richard.
Here's how:
Go to Payroll, then Employees.
Locate the employee.
In the Deductions & contributions section, select Start or Edit.
Click + Add deduction/contribution.
In the Deduction/contribution dropdown, choose 401(k) Catch-up.
Enter the necessary details.
Hit Save, then Done.
Please know that the Form W-2 reports contributions you and your workers made towards a retirement plan. Therefore, ensure that the amounts are reflected in their paychecks on their next pay.