You can use the formula bar to modify a formula within a cell in a grid. The ability to edit a formula with ease is essential, as formula syntax is likely to change for reporting purposes.
To edit a formula using the formula bar:
Select a formula cell, formula row, or formula column that contains or uses a formula. The associated formula is displayed in the formula bar.
Modify the formula in the formula bar. You can use the drop-down list of functions, to select a formula.
Validate the formula by clicking the check mark, , in the formula bar.