Mapping

Yes, we have mapping available for some things like custom fields and taxonomies. To map other fields, you’ll need to write a custom function, like this one:

function category_replace( $str ) {

    $replacements = array(
        "find_this" => "replace_with_this",
        "then_find_this" => "and_replace_with_this"
    );

    return str_replace( array_keys($replacements), $replacements, $str);
}

You can read more here: http://www.wpallimport.com/documentation/developers/execute-php/