With Undo / Redo, you can easily reverse any mistake in Creo Elements/Direct Modeling.
On the Quick Access Toolbar, you can undo or redo one step at a time. Click Undo One or Redo One.
To undo or redo,
1. On the Quick Access Toolbar, click the arrow next to Undo One.
2. Click Undo / Redo. The Undo dialog box opens.
3. To undo steps, select Backward. Either click Next, or type the number of steps you want to undo. Click .
4. To redo steps, select Forward. Either click Next, or type the number of steps you want to redo. Click .
5. If you want to see the history of all the commands you've entered in your Creo Elements/Direct Modeling session, click Expand. The Undo dialog box expands to display:
◦ States: lists the commands you've entered in your Creo Elements/Direct Modeling session.
◦ History:
▪ Max Back: displays the maximum number of commands you can undo.
▪ Max Forward: displays the maximum number of commands you can redo.
◦ Limit: displays the number of steps to keep in the History. To set or change the limit, click Steps, and type a number in the box.
6. Click to complete the operation.
Creo Elements/Direct Modeling tracks both the command history of Creo Elements/Direct Modeling and any active module applications.
• When you select Undo from Creo Elements/Direct Modeling, you may get a warning that you're about to undo a module application command.
• When you select Undo from a module application, you may get a warning that you're about to undo a Creo Elements/Direct Modeling command.
Undo One or 
Redo One.
.