/**
 * Limit the posts offered in the Post Reference dropdown to those with a particular term assigned
 * 
 * Edit 
 * 1. the slug of the post type in the if statement as required ('review' in this example) as well as the custom field slug 'wpcf-my-reference'
 * 2. the slug of the taxonomy ('colour' in this example)
 * 3. the slug(s) of the terms that should match ('red' in this example)
 */
  
function ts_filter_related_post_selector( $query )
{
    if ( defined('DOING_AJAX') && $_REQUEST['action'] === 'types_post_reference_field' && $_REQUEST['field_slug'] === 'wpcf-my-reference' && $query->query['post_type'][0] === 'review' ) { // edit
  
        $taxquery = array( 
            array(
                'taxonomy' => 'colour', // edit
                'field' => 'slug',
                'terms' => array('red'), // edit
                'operator' => 'IN'
                ) 
            );
  
        $query->set('tax_query', $taxquery);
    }
  
}
add_action('pre_get_posts', 'ts_filter_related_post_selector');

//Replace the following
/*
cptslug - replace with custom post type slug

parent - replace with parent cpt slug

child - replace with child cpt slug

Column Name - replace with the desired column name.
*/
//Add custom column
add_filter('manage_edit-cptslug_columns', 'my_columns_head');
function my_columns_head($defaults) {
$defaults['Parent'] = 'Column Name';//edit
return $defaults;
}
 
//Add rows data
add_action( 'manage_cptslug_posts_custom_column' , 'my_custom_column', 10, 2 );
function my_custom_column($column, $post_id ){
switch ( $column ) {
case 'Parent':
$parent_id = toolset_get_related_post( $post_id, array( 'parent', 'child' ) );//edit
if($parent_id){
echo get_the_title( $parent_id );
} else {
echo 'No Parent Found';
}
break;
}
}