How do I transfer an extension of stay from an old passport to a new one in Thailand?

Michael McKinney posted this in another topic

My passport only has maybe 7 more spots *available and will be shot in one maybe 2 more trips out.

I understand I'll need, both passports and a letter from Consulate stating new passport received.

Is transferring an extension of stay from old passport to a new one a relatively easy [quick] process as compared to obtaining the extension of stay (retirement)?

* some Malaysian I/O need to be a little bit more considerate when stamping. A page should fit 6, too many have just 4 ... just saying :)