Regarding Experience Certificate to Visa Office

[raj11]

Dear Forum Members,

           I have applied to CIO on May 5th and I received my 1st AOR on 5th Oct. My NOC code is 0213. My Visa Office is New Delhi. I have worked in the same company for 6 years. When I sent my documents to CIO I mentioned only my Client Companies and forgot to mention my Parent Company in the application. What should I do now if I want to mention my Parent Company to the Visa Office. Also I have some questions that I can post to this forum members and please give me your valuable suggestions.

                 1). Is experience certificate from Parent company is enough to send to the Visa Office stating that I worked for their clients which I have notified to CIO earlier?
                                                                                       (or)
                 2). Should I get letter from the Client Companies stating that I worked for them in that particular period of time?
                                                                                       
                 3). What should I do if the Client Companies are not willing to give a letter to me for the time period of work with them?

                 4). What should I do now when Iam sending my documents to Visa Office?


Regards,
Raj.