Need a function that separates over-lapping work shift hours.
 

We have temporary employees; sometimes an employee's hours will run over into
the next shift. Based on noting the employee's hours, I need a function
that will automatically sort out which hours are First Shift, which are
Second Shift, and so forth. Furthermore, I want the function to provide the
actual number of hours worked on that shift in a separate cell.

I'm thinking this will probably be a nested function, I haven't been able to
locate a function that will allow me to do the intial calculation. Any
suggestions?

Thank you.