How can my wife transfer her OA visa from an old passport to a new one for re-entry to Thailand?

The discussion highlights the issue of transferring a visa from an old passport to a new one. It emphasizes that a visa, such as the OA visa, cannot be transferred. The advice given is to carry both the old and new passports when traveling to Thailand, allowing the visa holder to present the old passport with the OA visa, and later, if needed, a new visa or extension can be obtained in the new passport.