PrF UG slots remove slot overrides
From Protege Wiki
Removing Overrides From a Slot
To remove the slot overrides at a class:
Select the class where you want to remove the overrides in the Class Browser.
Select the slot whose overrides you wish to remove in the Template Slots pane. Overrides are indicated by the override () icon.
Click the Remove Slot Overrides () button at the upper right of the Template Slots pane. The overrides will be cleared from the slot at this class and all of its subclasses. The slot will now match the top-level definition. Any overrides created at an unrelated class will still exist.