Survey point code location

Does anyone know where the actual codes are located to be edited.  We use a DOT standard but for in house projects I'd like to change how certain codes are used in a terrain.  I've scoured to the best of my knowledge to find this list of points and how to change them.  I can't find the dgnlib or wherever they come from.  I don't want to have to change them after I download them but the actual before code list.

Thanks

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