This will display a Formula Dialog Box which will suggest a default formula which is SUM LEFT in our case. In the Formula dialog box type the formula. Now comes the most important part of the formula.
This will bring up the Formula dialog with a default of SUM LEFT.
On the Table Tools Layout tab in the Data group click Formula. Select Microsoft Office Change Add or Remove Features Next. Insert a formula in a table cell. The next value we need to add is the flight number which is already there in the cell A2.