Time in Lieu - overtime

Hi All,

     Can anyone  guide me how to setup the following requirement

      Basis Working : Monday - Friday (8:00 hrs)

          We want to setup the system to log the overtime of an employee to Time in Lieu.

         Employee works 8 hrs per day as standard. Employee  overtime  threshols is 4 hrs /day.  Employee overtime to be calculated after the threshold time

      For example: if an employee works  14 hrs for the day and log the time sheet for the total 14 hrs  as actual worked.

           system has to calculate in the way as  ( 8+ 4 +2) hrs= 14hrs

          8 hrs --> the  actual / standard work  / per day

          4 hrs --> the overtime

         2 hrs-->  the overtime  to be added the time in lieu account

Kindly advise

Thanks

Vijay