Power Tools provides you with various utilities to speed up most of your daily tasks. The Formulas tool will help you change the formula type, get values instead of the formulas in the range, or perform quick calculations for all columns or rows.
The Formulas tool also processes cells in filtered & hidden rows & columns.
Choose cells under all columns where you want to insert totaling formulas and pick the necessary function from the list.
Simply enter additional calculations before or after the formula in the edit field, where %formula% stands for your current formulas in the selected range:
Click Run to change all formulas in the selected range at once according to the option you select.