To add a benefit or deductions, go to Employees then select the employee you want to edit. In the right-side nav, click "Benefits":

Here you can add benefits and deductions. Click "Add benefit" and select one of these options:

Enter the amount per paycheck, limit for the year, and employer contributions if applicable.

Benefits and deductions will show under the Deductions details on a payroll run:

Child support

We currently don’t compute child support but you can add it as post tax to determine net pay. For benefit type, select “Child support - Post tax” from the dropdown.