Merge/Group Columns into One RDLC

Hi, Can anyone guide me how to write expression or formula to merge columns into one. I need to merge Total into one (same like Title, merge 3 into 1) Can anyone guide me how to do this?
Title1 Title2 =========================================== ================================ Answer1 Answer2 Answer3 Answer1 Answer2 Answer3 Group1 X Y z x y z Parent Group Group2 X y z x y z Total 100 200