Sachin and Sumit,
You both can get in touch with Tata Memorial hospital and ask for the procedures for getting your child's HLA into their registry. They have set up the unrelated registry in Mumbai, India.
The donor's registry is for people who want to donate their bone marrow. The initial test is done with a simple blood test. Once, there is a match with a waiting patient, they call up the donor to see if he/she is still interested and then complete testing is done for HLA matchup.
With the registry having more and more donor's signing up, lots of people can hope for a cure - not only for thalassemia, but also for serious health problems like lukemia.