Hello Atul,
yes, it's possible: use a dependency (Procedure), saying
$SELF.CASING = 'TOWER' IF $SELF.HARDDISK = '850'
and allocate it inside the configuration profile.
Here the result:
having chosen '850' for HARDDISK, the Procedure is triggered and sets 'TOWER' for CASING.
Thanks and regards,
Flavio