Hi, i am on Non-O visa on yearly extension, my passport is due to expire and i am leaving home country for some work and plan to renew there and back to thailand. I am not renewing in Thailand. Once I am back, what is the process of transferring my yearly visa from old to new passport? 1) Do I need letter from embassy? 2) Does single/double/multiple entry visa makes a difference? Pls advice. thanks in advance.