Changing target set definitions system
You can extend an existing target set definition file by either adding a target set or by adding another target volume to an existing target set.
If you want to remove a volume from an existing target set, ensure that backups on the affected target set are deleted first. All FlashCopy relations of volumes in the target set must also be withdrawn. If you want to remove a target set from a target set definition file, ensure that backups on the affected target set are deleted first. All FlashCopy relations of volumes in the target set must be withdrawn.