Add a custom sortable column to a WordPress custom post type admin list.

sortable-columns.php

<?php

/**
 * 
 * Custom sortable columns on property admin list
 * 
 */

function property_id_column_register( $columns ) {
    // Insert property ID in between date/title
    $last = array_pop($columns);
    $columns['prop_id'] = 'Property ID';
    $columns[strtolower($last)] = $last;
    return $columns;
}

add_filter( 'manage_property_posts_columns', 'property_id_column_register' );

// Display the column content
function property_id_column_display( $column_name, $post_id ) {
 
    if ( 'prop_id' != $column_name )
        return;
    $prop_id = get_post_meta($post_id, 'wpcf-property-id', true);
  
    if ( !$prop_id )
        $prop_id = '<em>No ID entered!</em>';

    echo $prop_id;
}

add_action( 'manage_property_posts_custom_column', 'property_id_column_display', 10, 2 );

// Register the column as sortable
function property_id_column_register_sortable( $columns ) {
    $columns['prop_id'] = 'prop_id';

    return $columns;
}
add_filter( 'manage_edit-property_sortable_columns', 'property_id_column_register_sortable' );

// Make our sorting work

function property_id_column_orderby( $vars ) {
    if ( isset( $vars['orderby'] ) && 'prop_id' == $vars['orderby'] ) {
        $vars = array_merge( $vars, array(
            'meta_key' => 'wpcf-property-id',
            'orderby' => 'meta_value'
        ) );
    }
 
    return $vars;
}
add_filter( 'request', 'property_id_column_orderby' );

?>