I wonder why you are using those coordinates which is a GUI thing for users ?
Why don't you tell your program to use directly the column number ?
Excel.Range araAt = raporWrkS.cells(columnNumber,1);
araAt.EntireColumn.Insert(Excel.XlInsertShiftDirection.xlShiftToRight,
Excel.XlInsertFormatOrigin.xlFormatFromRightOrBelow);