How to obtain a certified copy of will / mrutu-patra

Hi,

I wish to know below

1. How to obtain a certified copy of mrtu-patra/will? I just have a vide document number from sub registrar of assurance in the format as 1234/5678.

2. Can I get it On-line, I mean over the internet?

3. Do I need to visit the local branch where it was filled or I can get it from any sub-registrars office ?

Please advise

Thanks!