Are you sure that there were no amendments done after april 2018 and the officials follow it in bangkok? Do you know any foreigner who followed it in bangkok recently
I just contacted the labour dept. at Bangkok and they said they cannot do any changes for the work permit, I have to take a new one..where did you do the changes at?
I can add the new category of work as long as I quit the job and restart the procedure from the beginning(to stay in the same company)..that's what I was said by my HR.