Help require for caste certificate

Can any one please guide me to get my caste certificate for my kid admission? I want to obtain my OBC caste certificate but I do not have procedure and documents require. Also one of my friend mentioned I will require my fathers school leaving certificate for opt for cast certificate. Is that correct? I have my own cast certificate (issued in Pune) and also I have OBC certificate from community office (from Mumbai). Please Help me how can i proceed for the same. Can i use community provided cast certificate for kid admission? Thanks i advance