I am not too much familiar with the stamping policy but as far as I can assume that there is no clear policy regarding Lower berth quota and Ladies quota etc... Tickets in both the quota's can be booked if available but when the quota gets exhausted general quota comes into play. There can "X" no. of scenarios where a ticket gets confirm under the above quota's. But stamping rule is same as general quota and depends upon final status. Admins along with moderator sir need to come up with a specific rule when it comes to above 2 Quota's.