Start Time Tolerance deduction

Hi,

I have below requirement for calculating the loss from tolerance times:

DWS hours:                    

Planned Working Time -      08:30  TO 05:30

Begin Tolerance  --                08:30 to 09:30              

End Tolerance --                    05:30 to 06:30

If EE comes within the planned begin tolerance time i.e 08:30 to 09:30 AM, then there is no issue. But if EE clocks in at say 09:45 AM, then the system should clock 0:15 mins for deductions.

Also the deductions would only apply to 2 particular subgroups -- 01 and 02.

Can the experts please guide me how to do this. Does this need a PCR? If yes, how to do this?

Please help.