Extract data from a dropdown menu with a dropdown submenu

Hi, I'm trying to scrape the categories and subcategories of a website, the categories are in a dropdown menu, with the subcategories organized in dropdown submenus as well.
I tried to follow the tutorial Web Scraper << How to >> Iterate through item drop-down variations but it didn't work, the values return as null.

Url: .: Sistema de Consulta do Mapa Digital da Cidade de São Paulo :.

To see the menu, click here:


Above are the categories and below are the subcategories:

The ideal would be to have the categories in one column and the subcategories in another column.
Many thanks!

Sitemap:
{"_id":"geosampa","startUrl":["http://geosampa.prefeitura.sp.gov.br/PaginasPublicas/_SBC.aspx"],"selectors":[{"id":"menu","parentSelectors":["_root"],"type":"SelectorElementClick","clickElementSelector":"#cboCamadas option","clickElementUniquenessType":"uniqueText","clickType":"clickOnce","delay":2000,"discardInitialElements":"do-not-discard","multiple":true,"selector":"select#cboCamadas"},{"id":"categorias","parentSelectors":["_root"],"type":"SelectorText","selector":"select#cboCamadas","multiple":true,"delay":0,"regex":""},{"id":"subcategoria","parentSelectors":["menu"],"type":"SelectorText","selector":"select#cboSubCamadas","multiple":true,"delay":0,"regex":""}]}