What is the procedure for extending my Non-B visa in Thailand after 90 days?

The user is seeking information about the procedure to follow after staying in Thailand for 90 days with a Non-B Multiple visa and a valid Work Permit. According to a comment from another user, the typical process involves obtaining documentation from the employer and applying at the immigration office for a yearly extension based on employment. Initially, a 30-day under consideration stamp may be issued, followed by the final approval for a year-long extension.