I came up with a solution.
I have created a Property named "DW Position". Its Data Type is "Option Set", and for the Option Set, I defined two values: "Exterior", and "Interior". It is available for the Classifications "Door" and "Window".
This will be available for both Doors and Curtain Wall Panels classified as Doors. Just make sure to use this Property to set the Position value for both Doors and Curtain Wall Panels classified as Doors. Also make sure to use this Property in schedules, because the "Position" general parameter will not return any value for Curtain Wall Panels classified as Doors.
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