Aparna, very simple method to be adopted but one needs to understand what is the type of organisation, locations, the industry the cater to, the years in business. As all this will help overall, do they have research executives or only recruiters, do they have BDM's ??

Well! just to give u a rough way of making an organisation structure would be
1. Recruiter to handle verticals like BFSI, IT/ITES/BPO, Auto manu/ancilarry, FMCG, FMCD, Retails, Agriculture, Engineering --- Electrical & Electronics, Energy,
Foundry,Aero, Plastics.etc, Pharma, Like this if you find a specialist recruiter, then u can have a TL/ Mngr etc. BDM's will be seperate set of people.

Let me know on my queries & I will help u