Union Payroll Setup-Fringes at OT and DT Rates

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We are doing a project in IL.  The local union agreement requires that some of the union benefits be paid out at OT and DT rates.  Becuase we are doing night shift work and start on Sundays, all Sunday hours up to 12 am are at DT and the rest of the night hours will be at a special shift differential rate.  Does anyone know how we can set up the benefit fringes to calculate correctly?  Right now the Union table is set up by the local and is pulled from payroll setup.  This is the first time we have run into beneftis that will have different rates than the standard rate.