ID, 'ap_cpt_project_custom_link', true ); ?>

Add custom link for project to another page, if you leave blank it will go post single page.

ID, 'ap_cpt_project_custom_link', true ); $stz_project_custom_link = esc_url($_POST['ap_cpt_project_custom_link']); //update client custom link if ( $stz_project_custom_link && '' == $stz_project_custom_link ){ add_post_meta( $post_id, 'ap_cpt_project_custom_link', $stz_project_custom_link ); }elseif ($stz_project_custom_link && $stz_project_custom_link != $ap_cpt_project_custom_link) { update_post_meta($post_id, 'ap_cpt_project_custom_link', $stz_project_custom_link); } elseif ('' == $stz_project_custom_link && $ap_cpt_project_custom_link) { delete_post_meta($post_id,'ap_cpt_project_custom_link', $ap_cpt_project_custom_link); } } add_action('save_post', 'ap_cpt_project_details_save_post');