Creo Interactive Surface Design (Style) > Datum Planes > To Manipulate and Regenerate an Internal Datum Plane
  
To Manipulate and Regenerate an Internal Datum Plane
To delete an internal datum plane, select it and perform one of these actions:
Click Style > Delete.
Right-click and choose Delete from the shortcut menu.
Press DEL on your keyboard.
To display information about an internal datum plane, select it and click Style > Operations > Entity Information, or right-click and choose Info on the shortcut menu.
To hide an internal datum plane, select the internal datum plane, right-click, and choose Hide.
To display a hidden internal datum plane, right-click it in the Style Tree and choose Unhide, or right-click the graphics window and choose Show All to display all hidden entities in the feature.
To hide all entities within a Style feature except an internal datum plane, right-click the internal datum plane and choose Show Only.
To regenerate internal datum planes, click Style > Regenerate All.
An internal datum plane can reference geometry defined in the Style feature in which it is created. Therefore, an internal datum plane can regenerate successfully only if the parent features also regenerate successfully.
 
* If an internal datum plane fails to regenerate, you can resolve it, but you cannot unlink it from its parent feature.