Expiring save set and keeping clones

We are cloning between two Data Domains (CCR) and keep the same retention and browse period the same for both original save sets and the cloned save sets.

Now there is a need to expired the original save sets earlier and keep the clones for the original retention period, but

as soon as we change the status of the original save sets (nsrmm -o) or changing the browse and retention periods (nsrmm -e -w)

the cloned save sets also changes as well.

Even if a save set is deleted via the nsrmm -d -S xxxxx command, the cloned save set is also removed.

Are we doing something wrong? I was under the impression that the cloned save set could be set to expire at a different time than the original.

Is there a way to expire the original save sets without immediately expiring the clones as well?

Any help would be appreciated!