You can undo changes made to a scenario, but you cannot redo changes.
To undo changes made to a scenario:
In the Analysis Workbench, click a scenario name.
Click Actions and select Undo changes.
The Undo Changes window is displayed.
To search for changes, enter search values in the grid or select the changes and move them to the List of changes to discard.
Click OK.
To complete the Undo Changes request, click OK.