Studio
Overriding Views
The Query tab of an inherited view can be modified to retrieve extra fields. You cannot deselect fields that are being retrieved by ancestors, but any fields added as MDFs (or UDFs if working the SPT) can be retrieved using a view override:
Overriding Action Screens
It's also possible to override an existing action screen for an inherited action by appending fields to the ones already being retrieved by ancestors:
