submenuRoutes.js

import React from 'react';
import { Switch, Route } from 'react-router-dom';

import Submenu1 from '../pages/content/Submenu1';
import Submenu2 from '../pages/content/Submenu2';

export default ({ match }) => {
  return (
    <Switch>
      <Route path={`${match.url}/menu/submenu1`} component={Submenu1} />
      <Route path={`${match.url}/menu/submenu2`} component={Submenu2} />
    </Switch>
  );
};