Tag Unique Items. Any item that is not a potential duplicate of any sort will receive a “ADD Unique” tag.
Propagate Comments to Hash Dupes. With this option, sets of duplicates will have their comments copied to each other. You can select to choose the comment from the highest rated photo, lowest rated photo, or combine all the comments together.
Propagate Ratings to Hash Dupes. This option will copy ratings amongst hash duplicate sets. You can select to choose the rating from the highest rated photo or lowest rated photo.