Calculation of Overtime and storage in 2005 infotype based on inftype 2011

Dear Gurus,

I have a scenario.

I need to configure Time Schema is such a way, that i'll populate infotype 2005 with Overtime values; calculated on the basis of Clock in/out. There may be multiple entries for a person in a day. For example Clock in, Clock out for lunch, clock in after lunch, clock out.

Kindly guide me, which sub schema i need to alter and if possible in what way