Mike is correct. We cannot provide assistance to a person who is not an electrician and who is planning to do their own electrical installation work. It is an issue of liability. The owner of this Forum does not want us to give you the answer to the one question you asked, without also giving you the answers to the thousands of other questions that you did not know you needed to ask. If you or another person gets hurt, we don?t want you to claim that we should have told you something. But more importantly, we don?t want you or any other person to get hurt.
The only advice we are permitted to give is the advice Mike has already given.
I will state, however, that you are correct in saying the neutral and ground bars must be separated in a sub-panel. I refer you to NEC article 250.24(A)(5).
Your profile states that you are a contractor. But your question tells me you are not an electrical contractor. Therefore, I am closing this thread. If I have mis-judged the situation, then send me a Private Message, and I will reopen the thread.