submenu.html

<div class="nav-item dropdown">
    <a href="#" class="nav-link dropdown-toggle text-white" data-bs-toggle="dropdown">Subsidiaries</a>
    
<div class="dropdown-menu bg-light rounded-0 m-0">
        <a href="https://smgagroup.com/" class="dropdown-item">PT. Sumber Mineral Global Energy Tbk</a>
        
<!-- Sub-menu untuk PT Sumber Mineral Global Abadi -->
        <div class="dropdown">
            <a href="#" class="dropdown-item dropdown-toggle" id="submenu2" role="button" data-bs-toggle="dropdown" aria-expanded="false">PT. Sumber Mineral Global Abadi</a>
            <ul class="dropdown-menu" aria-labelledby="submenu2">
                <li><a class="dropdown-item" href="#">Sub Sub Menu 1</a></li>
            </ul>
        </div>
        <!-- Akhir dari Sub-menu untuk PT Sumber Mineral Global Abadi -->
        
<a href="https://www.sumberbiomassa.com" class="dropdown-item">PT. Sumber Biomassa Indonesia</a>
    </div>
</div>