I have a plugin which doesn't have import/export option in WordPress tools http://wordpress.org/plugins/color-manager/
How can I add this functionality?
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The question is too broad, but EVERYTHING IS POSSIBLE. I never tried this, but I can bet it's possible.
You have to gather some knowledge and walk trough the right way:
And then start tweaking as per your wish.
But the motto is: EVERYTHING IS POSSIBLE.