how to create custom taxonomy drop downs for parents and child

Can someone help me please, i’m not good with php. i have created a custom post type called “used-car” and a custom taxnomy called “used-car-category” in functions.php

Question:

I need to create a dropdown search form which displays a list of category and subcategory on homepage. example

dropdown 1 [car make] “category”
dropdown 2 [car model] “subcatagory”
Search button

when you select a car model in the dropdown eg audi, second dropdown will display the different model variant of audi.

catagory on the cms looks somthing like this:

audi < catagory
– a1 < subcatagory
– a6 < subcatagory
mercedes < catagory
– a class < subcatagory
– b class < subcatagory
– c class < subcatagory

i would like this search form to be displayed on homepage. can someone help me please? a working code would be helpful.

Thanks

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