Hi Ajay
In method GET_DQUERY_DEFINITIONS when you define the dropdown values ; you have to mention 01 , 02 , 03 as KEY and the descriptions as VALUE.
Then for adding calculation part you need to enhance the event handler for the search and do the calculation there and modify the operators being passed , before submitting the operators to the dynamic query.
before :
lr_query->get_query_result( ).
/Hasan