Let’s get practical. Say you have a page called “Products.” You want “Shoes,” “Hats,” and “Socks” to appear when someone hovers over it.
First, add “Shoes” to your menu. Then, grab it with your mouse and drag it right under “Products,” but slightly to the right. A gray box or line will appear, showing it’s a sub-item.
Repeat for “Hats” and “Socks.” Boom! You now have a neat little dropdown family. High-five yourself—you earned it.
How To Create A Drop Down Menu In WordPress? - BasicWebGuide