This is a settings overview for the Import/Export > Reviews page. 

Reviews: Import CSV 

1. Update item if review with comment_ID already exists. – This will replace/update the review with the imported one if comment_ID value is same. 
2. Ignore item if review with comment_ID already exists. – This option will ignore and not import the review if the target site already has a review item with same comment_ID.

Reviews: Export CSV

1. Post Type – Selects the post type.
2. Max Entries per CSV File – Maximum number of entries in the exported CSV file.
3. Date – Date range of data to be exported.
4. Ratings – Selects the max and min ratings that are to be exported (for eg, only 4-star and 5-star reviews). 
5. Status – Selects the status of reviews that are to be exported, such as Pending, Approved, etc.
6. Progress – Progress bar showing elapsed time.