You have to approach to District Collectorate office for that. The owner applying for conversion would obtain a conversion order which could then be used to construct residential units on land. On the other hand, it is easier to convert a dry land or Punjai Land into specific purposes for example township projects or layouts. But you have to pay conversion charges for that.
Yes, Punjai Land means Dry Land. You have to apply to district collector to convert your dry land or Punjai Land into the residential plot. It is the duty of the district collector to visit the area and confirm whether the land for which conversion is applied for is suitable for agriculture. A final decision on reclassification would be taken by DTCP and CMDA.