need stored procedure for controlling reservation limit

I have done  daily reservation  limit using stored procedure..i need a CRM Like Module..whereas admin can increase or decrease daily limit...

for Instance :A dropdownlist with items 1 to 50...if admin wants 2 increase limit to 15..he can choose form  dropdownlist and same should be reflected in stored- procedure and reservation page...[only 11 bookings left today]

how to achieve this scenario from front-end.. need code for the above