How difficult is it to change a Non-Immigration Visa Category O-A to a Non-Immigrant Visa Category B while in Thailand?

Changing from a Non-Immigration Visa Category O-A to a Non-Immigrant Visa Category B while in Thailand can be done, but it involves specific procedures and requirements. The process may vary in difficulty depending on the individual's circumstances, including documentation, employer sponsorship for the work visa, and compliance with Thai immigration regulations.