Get Pro Version'; return $links; } add_filter( 'plugin_action_links_' . APS_BASENAME, 'aps_pro_version_link' ); /** * Upgrade submenu page */ function aps_upgrade_submenu_page() { add_submenu_page( 'edit.php?post_type=adlpostslider', __('Usage & Support', APS_TEXTDOMAIN), __('Usage & Support', APS_TEXTDOMAIN), 'manage_options', 'usage', 'aps_upgrade_callback' ); } add_action('admin_menu', 'aps_upgrade_submenu_page'); function aps_upgrade_callback() { include('aps-upgrade.php'); }