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Not quite sure if I understand it correctly. Would you like to pull a drop down list from your CSV file and add it on a drop down field in your form? You can just copy the list and past it in the drop down field list.
If you would like to prepopulate the field, I am not sure how it is possible using a CSV file, you can prepopulate our forms via URL parameters, you can check this guide: http://www.jotform.com/help/71-Prepopulating-fields-to-your-JotForm-via-URL-parameters
Perhaps you can share to us more information on how your form actually works. We'll wait for your response.