[Koha] How to prepare excel for duplicate entries.

Hello Sir, I am going to migrate library books data into koha by using marc edit tool. *But the problem I m facing is that multiple entries of same title and all is importing in koha. * *Please tell me if there is any Marc tag for making single entry while importing data.* *Thanks,* *Varun Arya9897702497* <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>