Case Merge Premium Field Reference
This chart will help you understand the fields that come with the Case Merge Premium application, facilitating report creation and page layout usage.
Use the Merged By and Merged Date/Time fields when creating reports on merged cases.
The default criteria for duplicate detection uses the Subject Conversation field. You cannot edit this managed formula field, but if you wish to exclude more words and sets of characters, create a new formula field with everything you may want to exclude from the email's original subject.