I should have explained it better.
If I go down the DTV road next winter, I will stay 90 to 120 days in Thailand and then go back home. That summer my passport will expire, so will the time (180 days) I could have stayed on the stamp in my old passport.
So, coming to the airport with my new passport I will have my DTV e-visa still valid 4 more years, but with the wrong passport number on it. What is the step to get my visa to match my new passport?