Assets/Money Transfer from India to overseas on immigration

SUB :  Assets/Money Transfer from India to overseas on immigration for permanent settlement on immigrant visa  .

Hi ,

What are the rules and procedures to be followed for transferring money/assets abroad when a person plan to migrate  from India to a Western country for permanent settlement on immigrant visa  . He has got a house in a town which he wants to sell off and wish to carry the proceeds  along with his other deposits in banks , in foreign exchange through Indian banking channels , following all Indian rules and procedures legally .

Kind advise step-by-step , considering Indian Tax rules , Banking rules and other Govt. formalities .

Thanks in anticipation  ,   

PP 

==============================================================================================