I need to create a multiple -instance in CentOS. I reffered this file http://forum.openerp.com/forum/topic23730.html to create multiple instance , as they mentioned we need to copy & paste the config file as many times we need to create Multiple instance.  When i saw that file i found below code

[options]
; This is the password that allows database operations:
; admin_passwd = admin
db_host = False
db_port = False
db_user = openerp
db_password = False

Where i am not able to find 

netrpc_port = 8050
xmlrpc_port = 8049
xmlrpcs_port = 8051  This lines.

Is it correct file to edit? or Where can i find the openerp-server.conf file?

If any other documents is there to create multiple-instance in CentOS. Please send.

Thanks in advance