Sum row by column

I want to sum row by column to export the excel. could you tell me how to do it.

thank you.

I’m not sure if I understand you correctly. Could you describe more in details required result?

Just like the excel - A3,B3,C3,D3 , sum(a3:d3), using the grid to show it.

you may place sum in footer.
Value from footer will be exported in excel correctly.