On my page, users are required to select a product using drop down filtering with four levels: Category, SubCategory, Product, and Variant. However, it can be cumbersome for users to navigate through each drop down to get to the final variant. I am looking for a solution that would allow users to select all values with a subnavigation within a single drop down, similar to the functionality shown in this link: https://i.sstatic.net/YMoQX.gif. Any suggestions on how to achieve this would be greatly appreciated.