Ajouts menus dans dropdown

Bonjour a toutes et a tous..
Juste besoin d'ajouter 3 onglets et d'autres categories dans les onglets de mon menu dans ma barre..
Tres tres debutant en bootstrap
D'avance je vous remercie
Code:
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<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#"></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Vide
<span class="sr-only">(current)</span>
</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Vide</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Chiens
</a>
<ul class="dropdown-menu multi" aria-labelledby="navbarDropdown">
<li class="dropdown-submenu">
 <a class="dropdown-item dropdown-toggle" href="#">Catégorie 1</a>
<ul class="dropdown-menu">
<li class="dropdown-item">
<a href="#">Sous catégorie 1</a>
</li>
<li class="dropdown-item">
<a href="#">Sous catégorie 2</a>
</li>
<li class="dropdown-item">
<a href="#">Sous catégorie 3</a>
</li>
</ul>
</li>
<li class="dropdown-submenu">
<a class="dropdown-item dropdown-toggle" href="#">Catégorie 2</a>
<ul class="dropdown-menu">
<li class="dropdown-item">
<a href="#">Sous catégorie 1</a>
</li>
</ul>
</li>
<li class="dropdown-submenu">
<a class="dropdown-item dropdown-toggle" href="#">Catégorie 3</a>
<ul class="dropdown-menu">
<li class="dropdown-item">
<a href="#">Sous catégorie 1</a>
</li>
<li class="dropdown-item">
<a href="#">Sous catégorie 2</a>
</li>
</ul>
</li>
<li class="dropdown-submenu">
<a class="dropdown-item dropdown-toggle" href="#">Catégorie 4</a>
<ul class="dropdown-menu">
<li class="dropdown-item">
<a href="#">Sous catégorie 1</a>
 </li>
<li class="dropdown-item">
<a href="#">Sous catégorie 2</a>
</li>
<li class="dropdown-item">
<a href="#">Sous catégorie 3</a>
</li>
</ul>
</li>
</ul>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Vide</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Rechercher</button>
</form>
</div>
</nav>
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js" integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV" crossorigin="anonymous"></script>
<script>
window.onload = () => {let menus = document.querySelectorAll(".dropdown-submenu a.dropdown-toggle")for(let menu of menus){menu.addEventListener("click", function(e){e.stopPropagation()e.preventDefault()let sousmenus = document.querySelectorAll(".multi .dropdown-menu")for(let sousmenu of sousmenus){sousmenu.style.display = "none"}
this.nextElementSibling.style.display = "initial"})}}
</script>
<script src="script/jquery-3.6.0.slim.min.js"></script>
<script src="script/popper.min.js"></script>	
<script src="script/bootstrap.min.js"></script>