I want to know when and where use some OPM items in Default Category Set form

I want to know when and where use some OPM items in Default Category Set form:

Product Reporting

Process Allocation Class

Process Sequence Dependency Class

Process Substandard Item Class

Process technical Class

Process GL Class

Process GL Business Class

Process Cost Class

Process Product Line

PLease you help me.

Regards,

CUONGNT