Is there any possible for bandwidth restriction for Hotspot ?
Yes, you can limit overall Server Profile Rx/Tx rates, User Profile rates, and individual user bandwidth limits.
How to bandwidth restrict on 450G port as per our required ?
Server profile rate limits (search for “rate-limit” setting):
http://wiki.mikrotik.com/wiki/Manual:IP/Hotspot/Profile#Properties
User profile rate limits (search for “rate-limit” setting):
http://wiki.mikrotik.com/wiki/Manual:IP/Hotspot/User#Properties_2
User data limits limits (search for “limit-bytes-in”, “limit-bytes-out”, and a few more after that):
http://wiki.mikrotik.com/wiki/Manual:IP/Hotspot/User#Properties