I know where I can delete tapes one by one, as I have them all in a virtual tub. I have about 10000 tapes to delete.
Please refer to the following documentation - https://documentation.commvault.com/commvault/v11/article?p=10237.htm#o10244, this should guide you through the steps to delete Media
Important Note - Once contents of the media are deleted, the contents are not available for data recovery operations. In addition, the next data protection operation does NOT become a full backup automatically. After you delete the contents of the media, run a full backup immediately for all the subclients that are associated with the media.