What if you need to create an action with several commands, and you need another similar action; possibly one action that performs several commands and ends with the Curves adjustment. And then another action that performs the same commands and ends with the Levels adjustment. If that's the case, there is no need to reinvent the wheel, just create the first action, make a copy, and then modify the copy.
Actions Palette.
expand triangle of the action you want to change.
Create New Action button on the Actions palette.
Actions Options button, and then click
Duplicate .