For Transfer of Katha from one person to another based on the documents like sale deed, will, gift deed, family partition, release deed, in respect of properties already having khatha:-

Application in prescribed form

Title documents, flow chart of the title

Copy of upto date tax paid receipt

Affidavit regarding / inheritance / gift / court decree./ purchase of flat

Original Death certificate in case of Kathadar’s death

3) Now you can apply for Khata through online module.

Visit http://bbmp.gov.in/khata

4) as far as charges for khata transfer local lawyer can guide you in this regard

You should catch hold of the builder/vendor to get the khatha transferred to your name.

If you already possess registered sale deed then you dont need to have any supplementary deed, it is not understood that to which supplementary deed is the registrar referring to.

Panchayat board is not the authority to issue khatha.

If the khatha is still in the builder's name, then he has to arrange to get it transferred to your name, at least he has to help you sort this out, by guiding you properly.

You can take the help of an advocate in the local and try to initiate steps legally if the builder is not cooperating.