how to customize linkstructure listing categories

Hello all

When I make a listings category with a sub listings category, like for example:
main listings category: buy-product-x
sublistings category: state
subsublistings category: city

and with the following:
Listing Slug Name: listing
Category Slug Name:listingcategory

I get this on the sub sub category page as link / linkstructure / url:
https://www.domain.com/listingcategory/city/

But I would like to have this structure:
https://www.domain.com/listingcategory/buy-product-x/state/city/

How can I achieve this? Which php files, which code?

Does anyone know or can help?

Thanks in advance

Ray