Yes, it is possible to export Graphic Override Combinations and Model View Options Combinations only one by one. I suppose this is because you have to provide a file name for them, and for that, they must be exported individually.
You can make a wish for this feature, we can vote on it and if it gets enough support, we can submit it to Graphisoft for consideration.
I agree that it would be a useful feature.
If you do make a wish, please post its link in this thread.
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