How to Iterate through drop down and the corresponding dropdown and store values in excel

Hi Team,

I have one query on following website:
There on top when we hover at “add vehicle” option we see the following window:

Here on selecting each year we have corresponding values of brands as follows:

on selection of each value from this model and engine are auto populated or can be selected if more than one are there.

My issues is that how to store all these values in excel with each year to each vehicle brand to each model and each engine?
I tried find children but it gives empty list.

Please any help would be appreciated.