Avnish,
If you have make just bbb-client mods...
1) you build a brand new server from packages on production server,
2) then you copy the dev client directory in its entirety to server
3) set permission to same as production client
5) edit the config.xml file, and make a change to /etc/bigbluebutton/nginx/client to point to your custom client.
6) restart nginx
Having it in its own directory, versus overwriting /var/www/bigbluebutton/client prevents it from being overwritten on package update accidently.
regards,
Stephen