Bootstrapのナビゲーションバーを2段にする方法

<!-- 上段のナビゲーション -->
<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <div class="container-fluid">
    <a class="navbar-brand" href="#">MySite</a>
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarMain" aria-controls="navbarMain" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarMain">
      <ul class="navbar-nav me-auto mb-2 mb-lg-0">
        <li class="nav-item">
          <a class="nav-link active" href="#">ホーム</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">メニュー</a>
        </li>
      </ul>
    </div>
  </div>
</nav>
<!-- 下段のナビゲーション -->
<nav class="navbar navbar-expand-lg navbar-dark bg-secondary">
  <div class="container-fluid">
    <div class="collapse navbar-collapse" id="navbarSub">
      <ul class="navbar-nav me-auto">
        <li class="nav-item">
          <a class="nav-link" href="#">カテゴリー 1</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">カテゴリー 2</a>
        </li>
      </ul>
    </div>
  </div>
</nav>