Custom Taxonomy added to custom post type (add to functions.php)

custom-taxonomy-custom-post-type-sortable.php

<?php 
/* 
  add this to your functions.php
  replace 'mytax' with your custom taxonomy
  replace 'mypost' with your custom post type
*/

/* 1. add mytax to mypost */
function set_custom_columns($columns) {
    $columns['mytax'] = __( 'My Tax Name', 'your_text_domain' );
    return $columns;
}
add_filter( 'manage_mypost_posts_columns', 'set_custom_columns' );

/* 2. add to the column */
function custom_column( $column, $post_id ) {
    switch ( $column ) {
        case 'mytax' :
            $terms = get_the_term_list( $post_id , 'mytax' , '' , ',' , '' );
            if ( is_string( $terms ) )
                echo $terms;
            else
                _e( 'Unable to get your taxonomy', 'your_text_domain' );
            break;

    }
}
add_action( 'manage_mypost_posts_custom_column' , 'custom_column', 10, 2 );

/* 3. make it sortable */
function sortable_release_column( $columns ) {
    $columns['mytax'] = 'My Tax Name';
    return $columns;
}
add_filter( 'manage_edit-press-and-news_sortable_columns', 'sortable_release_column' );
?>