For a Payroll Deduction IRA (i.e., an employee's personal IRA), do I setup a deduction, or just split their direct deposit? I don't see a deduction that matches this.

I tried to add a new Deduction, but didn't see a way to deposit the money to the employee's IRA. I assume splitting the direct deposit is the way to go.
IRS description of Payroll Deduction IRAs: https://www.irs.gov/retirement-plans/plan-sponsor/payroll-deduction-ira