Need a drop-down list of categories like Avito

You need to write a component for InstantCms that will replace the standard drop-down list of subcategories (skrin1) with a drop-down list of subcategories as on the Avito site (skrin2). Copy completely to be the same as the avito (colors can only be made by others).
+ make cagain so that the component is attached to only one domain.

The website is called InstantCms.