To delete a type, select Delete from the right-click actions menu for that type in the navigation pane of the Manage Types window, or from the Actions menu of the type information page. If the type cannot be deleted, the Delete action is not available.

Deleting a type also deletes all of its subtypes, as well as permanently deleting all properties, layouts, attributes, and constraints defined on the type or its subtypes. Any object instances of the deleted type or its subtypes present in the system remain, but are now considered to be instances of the parent type of the deleted type. Any values for attributes that were defined on the deleted type or subtypes are permanently deleted from those objects.