What'a the process to obtain H1B in TCS, is it dependent on account level or anyone can participate to obtain it?

Your manager gets a headcount approval every year for his portfolio and he decides who.

Then after your manager confirms, you raise an LCA request in GESS which needs to be approved by your manager, client partner and/or RMG. Once it is approved in all levels, Visa team will take care of doing the prep work for lottery. This usually happens in feb/early march.

March last week is usually the lottery.