Sage 300 Payroll Setup (Earnings and Deductions)

How would I set up a group life insurance policy for which the employer pays 100% of the premiums but get coverage in excess of $50,000? I'm mostly concerned about tracking the tax to the employees. Do I need to set up two different benefits - one that tracks the exclusion amount and the other that tracks the excludability? Is it also possible to use a formulaic method to calculate the benefit?