write a letter of application attaching your current CPL,Class 1 medical,
and ask for a NOC for an indian class 1 medical.
get two copies done.originals will have to be carried along.
get to the dgca office and talk to/meet the head of the medical section,
when i had last gone it was M.T. Bokade.
he will take your application,get a 'letter recieved stamp' from the recieving section next to the reception.
wait for 10 days or so then go around,show your recieved stamp and get your NOC.
atleast thats what i did.
P.S. they will forget to give you a file number 9 times out of ten.then you are had, well and proper,the ensuing process is a nutcracker,i would suggest getting a class 2 then going on to get a class 1.much less pain that way.