You can delete items from the Object Mapping Editor using the "delete" option from the context-sensitive menu.
You can also select the item you want to delete and press »DELETE«.
If you delete a component name that is still used in a Test Case for this Test Suite it will reappear when you select "refresh" from the context-sensitive menu.
If you want to remove all unused mappings from the Object Mapping Editor , then use the Cleanup option 3.15.3.1.