How to create a data slice using exit class

Hi All,

Cube has a characteristic called cut of date, i want to apply data slice on the version when the current date >= cut of date. I want to do this using a data slice with exit class. I had created a class similar to CL_RSPLS_DS_EXIT_BASE. Could you please guide me in which method i should put my code, and what declarations should be given. Is exit class necessary for this or is there any other way to do it.

Thanks in Advance.