I found this gem on the ADSM site:

"Unlike backups, once a file is archived, its
retention is set in stone (you can delete archive files however)."


Scenario:
Client creates a management class called "3_Month" and sets retention at 90
days.
Later they change their mind, and create another management class called
"1_Month"
and set it to 30 days.  All current archives go to "1_Month".

They want to ditch as much of the "3_Month" as possible, without getting rid
of anything newer than 30 days...

Is there any way to accomplish this without deleting individual archives?