Can You Convert an O-A Visa to an O Visa Without Exiting Thailand?

This is how you go from an O-A visa/extension to an O visa

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NO immigration office can do an in country conversion from an O-A visa to an O visa. That requires exiting the country to "break the chain" of the O-A visa/extension, come back on a 30 day visa exempt entry and then applying for a NEW 90 day Non-O visa at an immigration office as long as the immigration office where you live can do that conversion from a 30 day visa exempt to a 90 day Non-O.