changing your tabian baan isn't too much of a problem, as long as you follow the problem is that the change depending on your location & circumstances.
here's my story then...
i went to the local ampur office in the town where i'm living, let's call it nakom nowhere for now. i asked them to sort me out with a new tabian baan (tb), however in order to do this one has to go back to the original ampur office that issued the old tb so i went back up to BKK. the BKK office cancelled (actually they stamped on it that i had moved) my old tb, but they let me keep it, and issued me some sort of form to give to my new ampur. now they said i had 15 days in which to register my new address or i'd lose my tb altogether. the whole process took about 30 mins. in the office and didn't cost a penny.
so i wen back to nakom nowhere and gave them my old tb, the form, my passport & 60 baht. they spent about a hour updating the tb with my new address, which is prolly right for an out of town ampur.
i was hoping that i could keep my BKK tb in-tact & get a new one issued at nakom nowhere, just so as i'd have two of em'... but no such luck!