Currently I have variety of options positions (few are covered, hedged, open etc) Now I am trying to add couple more options. While fetching margin, I'm unable to understand what will be my nett required margin if I execute that order.
Rather than checking the margin for each order separately, you can easily check the combined margins by including both orders in the basket order API as a single request. This approach will provide you with the net margin requirement details. Additionally, you might find it useful to read this article for more information on initial and final margins.