Changing the profession is a very difficult task and in your case it will be better for your Company to do it during the renewal of your RP.

You have to provide the following documents for changing the profession.

1. your Digree certiciate attested by various ministries.
2 6 months salary statement
3 New job contract 3 copies
4 old job contract
5 Electricity Bill
6 CR Copy
7 NOC from the sponsor
8 Application form
etc..

Let your PRO handle the issue.