The community members are discussing how to create a dropdown menu. Some suggestions include checking templates in the marketplace, using a navigation/menu system, and looking at the Craft Library if using the Craft CMS. One community member is using the FinanceFlow template but it does not have a submenu feature. There is no explicitly marked answer in the comments.
Are you looking for a menu system or just a dropdown like a <select>?
The navigation/radix documentation is currently empty on the docs.webstudio site but you can figure it out by watching some of the older Webstudio youtube videos about navigation.