Add functionality to a Wordpress theme to import and map CSV file to existing custom post type

We require modifications to the AutoStars theme by IMIThemes to allow us to have scheduled imports of a CSV file and map the fields to the custom fields within the Listing custom post type. We will provide the fields which require mapping. We will require an interface in the backend of Wordpress to specify the location of this file and how often to do the import. Additional features required: * We will need the csv import function to compare stock number against a custom field. If it exists, update record and PUBLISH. If it doesnt exist create new listing. * As a mop up process, for records with Status Sold, if Sold date is 5 days old, set listing to DRAFT. We need a fairly quick turn around on this job so would prefer someone who has worked on a similar project and can show us examples. Feel free to message me if you have any questions.