How to reset one or more cells (External Data)
You would like to reset one or several cells to cancel changes, here's how
Make sure to be in the Base Alternative/Strategic Alternative/Strategic Building Block → External Data tab.
Once you found the cell or group of cells you would like to reset, click on it (or click and drag to select several cells at once) to select it, right-click, and click on Reset Cell(s).
The cell(s) that you selected will now erase all changes that were made to them and display the values they were displaying originally.