Addition Or Deletion Of Property Owner Name From 7/12 And City Servey Etract

We hold ancienter property of about 2000 sqm. Which was to given to development by a grandparent ; perhaps the development was not completed by builder meanwhile one of partner of builder team death and both grandparent of us also death, to whom with development agreement was made. The rest of the builder partially completed the apartment and named it as A type building with an area of 756 sqm and also done the apartment deed for the building structure constructed. We still have held on rest of the land and a few flats in the building. On the basis of the above scenario, I want to ask a few questions 1) is it right to add names of the apartment on 7/12 etract and city servey extract 2) if yes then the land property owner ie our names will be deleted from e On the basis of the above scenario I want to ask a few questions 1) is it right to add the names of the apartment on 7/12 etract and city servey extract 2) if yes then land property owner ie our names will be deleted from the extract and who hold property right if we want to finish rest of work