If you refer Wikipedia for Limited Liability Partnership Act 2008, you will find that there is no reference of designation as such. Secondly, LLP or Limited Company or Private Limited Company, Indian laws do not talk about designations at the level of Managers.
Designations is an internal matter of your company. Yours appears to be MNC. Therefore, your management could be following the rules prevailing in the country where their Head Office is located.
4th January 2018 From India, Bangalore