Edit History

@Nishith so, 

$tab = new Tab();

        $tab->active = 1;

        $tab->class_name = "AdminSubMenu";

        $tab->name = array();

        foreach (Language::getLanguages(true) as $lang) {

            $tab->name[$lang['id_lang']] = 'Sub menu';

        }

        $tab->id_parent = (int)Tab::getIdFromClassName('< What I should add here, since I don't have to create a parent controller');

        $tab->module = $this->name;

        $tab->add();