Hello Tamaro722,
You can create two unscheduled paychecks for your employee's severance pay.
When doing so, take note of the employee's schedule, as this will impact the paycheck. If the employee is on a bi-weekly basis, you'll have to change the pay period date and pay date manually. If they're an hourly employee, you'll have to adjust the number of hours. For a salaried employee, you'll have to divide the number of hours into two.
Just a heads up, you might want to check with your state if this step works for them since some states have different regulations.
After creating the final paycheck, you'll have to update the employee's status in your payroll service. Here's an article for the detailed steps: Change an employee status.
I'm always around whenever you have payroll concerns.