Understanding the Khata and difference between A khata Vs B Khata

Khata guide for apartments betterment charges for b khata Khata Transfer - Type B ₹30238 ₹37797 19% off Payment of betterment charges or conversion fees has to be paid to the concerned authorities View All betterment charges receipt online 7 Fee Charges to be paid to get this service Fees to be paid for registration of khatha 2% on the stamp duty of the sale deed 8 Maximum number of days to

betterment charges for b khata B' Khata + DC Converted In this case what are the necessary documents required for paying betterment charges to get 'A' Khata Kindly help