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The easiest way to get an odt (or rtf or whatever) file into Calibre is just to drag-n-drop it onto the main Calibre window (assuming this is a book you have not already set up in Calibre).
If you have already got the book created with covers and such then I would go into "edit meta information" and drag-n-drop the odt (or rtf or whatever) file into the "available formats" box, then click OK.
When you click on "convert books" the "Input format" menu in the top left corner should then list all the formats you have available (from the "available formats" box).
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