Every organisation is different, with a wide range of differing requirements, organisational arrangements, company set up etc etc.
If you were to go to Air India, IndiGo, SpiceJet, Vistara etc, etc, you would find they all have differing policies. There will be some basic policies which take into account legal requirements that ALL Indian companies need to observe, but outside of that, companies decide their policies based on THEIR circumstances and all the regulations that the particular industry operates under.
If you do not have the skills to undertake this work, you will need to either outsource, or employ a person qualified to do it.