When you need to set up a category for temporary employees, follow these steps.
1. Set up the Account Status “Temp Employee”.
a. Go to Company Settings>Global Setup>Global List Definitions>Accounts Status List. Click on Add New Status
b. On the next window do NOT check Is Terminated or In Payroll. Leave these blank. Click OK
2. Because you need to wait until the employee is set up to assign their Account Status the pay Period Profile will be selected for the employee. You will want to make sure that you go to Company Settings>Profiles/Policies>Pay Periods>Edit Pay Period Profile.
3. Check off Auto Remove Employees When Account Status is Not in Payroll And Is Terminated is Not 
Checked
This will ensure that a check is not processed through in payroll.