Application.Undo method (Project)
Executes an undo action on items in the Undo list.
expression A variable that represents an Application object.
|HowManyUndos||Optional||Long||Specifies the number of items from the list to undo. The default is 1.|
Many actions you perform in Project, such as adding a task, add items to the Undo list. To redo one or more actions after using the Undo method, you can use the Redo method or click Redo in the Quick Access Toolbar.
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