I am asking this question on behalf of a friend. They currently have a job teaching in Phuket with a valid work permit and extension of stay valid until March 2021. They have been offered a new job teaching in Bangkok. Under the current rules what is the correct process he should follow to end up with a valid extension and work permit for the new job (all paperwork is available from both schools). Obviously he will not be leaving the country.

Thanks for your expertise.