@ssharanya29
Please refer the below document for deleting classification data.
https://experienceleague.adobe.com/docs/analytics/components/classifications/classifications-importer/t-delete-classification-data.html?lang=en
Multiple classifications can belong to the same variable. For example, you can have 2 different classifications of product . If you would like to only remove a single classified value, replace the classification value with ~empty~ . For example:

Using ~empty~ under the Brand Category classification still preserves data for the Product Name classification. The ~empty~ value only deletes classification data for that cell.
Use ~deletekey~ in any column to delete the entire classification row
For example:

Using ~empty~ under the Brand Category classification still preserves data for the Product Name classification. The ~empty~ value only deletes classification data for that cell.