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add_action('admin_menu', array($this, 'wmsac_dashboard_right_menu'));
    function wmsac_dashboard_right_menu() {

        /*
         * MAIN MENU PAGE
         */

        add_menu_page('WMSAC Page', 'WMSAC', 'manage_options', 'wmsac-options', array($this, 'wmsac_main_page'), 'dashicons-randomize');

        /*
         * SUBMENU PAGES
         */

        add_submenu_page('wmsac-options', 'Reports', 'Reports', 'manage_options', 'wmsac-reports', array($this, 'wmsac_reports'));
        add_submenu_page('wmsac-options', 'Phone Orders', 'Phone Orders', 'manage_options', 'wmsac-phone-orders', array($this, 'wmsac_phone_orders'));
    }
    function wmsac_phone_orders() {

    }
    function wmsac_reports() {

        echo '<div class="wrap"><h1>Wagner Meters Reports</h1></div>';
    }
    function wmsac_main_page() {

        echo '<div class="wrap"><h1>Wagner Meters Shop As Customer</h1></div>';
    }