Backup Exec Utility Archiving Option tasks

Hi,

I need free up a disc (4TB) of my pool backups to split into 2 disks 2TB each. However this disk has data backups that I would like to delete.
Do not want to miss the references in the catalog, just delete the files from the disk because it already went to tape and I need to split into 2 discs If I ever need to restore these files, I will have to tape.

I was in Backup Exec Archiving Option Utility tasks but the options were not enabled.
How to accomplish this without major losses?
Thanks in advance.