Calculated field in classic report

Question

I am trying to editable columnin classic report and based on the values that users fill in that filed calculate value in another column. I have seen something similar on the forum but nothing really worked for me.
My report is based on sql query.
select column1,
column2,
column3 from table
I want column2 to be updatable, and that column3=column2+column1

Answer 1

Sorry, in this thread you can see better what I meant in the post above.
ROW-------Country-------LOB-------YTD_PURCHASES-------YTD_INCOME-------Manual -------Total                              
1-----------USA-----------Utilities-----------1000000-----------50000----------------0-----------50000                              
2-----------USA-----------Electric-----------1000000-----------70000-----------------0-----------70000                              
3-----------USA-----------Security-----------1000000-----------90000------------------0-----------90000                              
4-----------CAN-----------Utilities-----------1000000-----------110000---------------30000-----------140000                              
5-----------CAN-----------Magic-----------1000000-----------130000--------------25000-----------155000                              
6-----------CAN-----------Plumbing-------1000000-----------150000-----------------0-----------150000                              
Thanks,
Gagi