how to add column 1&2&3 and write it on to 4th column
Welcome to UiPath Community!
I hope you need to add columns in a excel file.
You have to read that excel as a datatable as “DataTable1”. And a new column “Total” in that table, then in assign activity you have put this expression.
DataTable1.Columns["Total"].Expression = "Column1+Column2+Column3";
Can you explain your requirement more clearly?