Dropdown menu is something that handles by CSS or javascript (in some case) So a your theme should take care of that not the wordpress engine. When you add a nested menu items on wordpress menu that means wordpress will output a specific html structure for that menu.
<ul>
<li></li>
<li></li>
<li>
<ul class="sub-menu">
<li></li>
<li></li>
</ul>
</li>
</ul>
So, your theme css will have to use appropiate css to handle the dropdown funcitonality. Hope it clear.
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