You can undo and redo most operations one at a time and sequentially provided you have not closed a layout file or exited the Creo Layout application. You can undo or redo actions using one of the following methods:
• Click or on the Quick Access Toolbar to undo or redo the most recent action.
• Press CTRL+Z to undo or CTRL+Y to redo the most recent action.
or 
on the Quick Access Toolbar to undo or redo the most recent action.