Hi, hope your are doing well!

Assuming you are asking about the post.

The first post a Commissioned Indian Army officer gets is a Lieutenant followed by a Captain after 3 years of service (excluding ante-date seniority), a Major after 4 years of service and a Lt Colonel after 13 years, a Colonel, a Brigadier, a Major general, a Lieutenant General, a General, a Field Marshal, After Lt Colonel post, promotions are based on selection depending on the frequency with which positions become free.

If you are asking about posting/transfer, the first one is at your base station and once you complete your first tenure it depends on other base's postings and requirements. Usually one even gets to fill a preference form to choose their base preference from a number of stations that the department gives you. Its never decided beforehand.