Shift Differentials Overtime

Summary:

I am able to convert Regular Hours and allocate the hours to three different shifts and pay them different rates. That I have no problem with. However, what I need some assistance with, or clarity is the Overtime component. I am able to generate overtime for one of the Shifts but not all three of them.

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Example:

Employee Clocks- In and Clocks-Out, my time calculation rule converts those hours and splits them out to different shifts and different rates. However, once they eclipse 40 hours worked in the week, whatever is worked after that needs to be overtime for the specific shift they are working.