Dropdown Hover Shopsystem

How does it possible to grab a dropdown Hover - have absolut no idea.

Example: https://i.imgur.com/9AD8A3L.gif

Url: https://www.teknorc.com/
its legal: the provider dont want to give a complete database, they told us: if you want to resell the products -you have to pick up product per product.

Sitemap:
{id:"absolut NO IDEA how to.."}

You probably don't need to; all the products are also listed when you just click on the main tabs without clicking on the dropdowns e.g. Vehicles, Engines, Parts etc. It'll also lead to a new Url where you can build a sitemap and starturl, e.g. https://www.teknorc.com/product-category/vehicles/

Thanks, but i need the category in Sub categorys