Your question seems to me not so clear.What is your actual status you would like it to be? A Principal Employer? or a Contractor? From your narrative preceding the question, I think the central issue is that you want to be both ie., a contractor to your principal employer viz., the Central Govt Undertaking and at the same time, a principal employer to the contractors you engage to carry out the works you have contracted to do for your principal employer --- Am I right? I do hope that you will easily understand that a positive answer to your question is not at all possible because of the full import of the terms 'contractor', 'establishment' and 'principal employer' in the back-drop of the purpose of the Act and with reference to the scheme of the Act. I,therefore, would like to quote the following observations of the Judiciary so that you can cull out the answer yourself:
"On a careful consideration of the scheme and various provisions of the Act, it appears that only one principal employer is contemplated under the Act. ---- There are two distinct ways in which the Act seeks to regulate contract labor.Sec 7 deals with the 'principal employer' whereas Sec 12 deals with the 'contractor'.These two provisions and the methods of regulation show that a person cannot be a licensee u/s 12 of the Act as well as a principal employer u/s 7 of the Act."
Gammon India Ltd. v Asst.Commr. of Labor, (1976)I LLN 410.
" A person cannot be both a contractor as well as a principal employer."
Feroz Sons v. B.C.Basu, (1979) 54 FJR 158 (Cal).