Can you transfer a DTV visa to a NON-B visa and how do you cancel a DTV?

A user inquired about transferring a DTV visa to a NON-B visa after finding employment in Thailand. Responses suggest that while it's theoretically possible to convert a DTV to a NON-B visa at an immigration office, the process may be complicated due to the need for extensive documentation from the employer. They may prefer to handle the process outside Thailand, necessitating the cancellation of the DTV visa, which might require assistance from the original consulate that issued it. Additionally, there are concerns about the tight timelines for obtaining necessary documentation for the visa extension.