WoollyAdmin joined the community
I believe what you're asking for is nested folders (where a folder is the link present in the navigation bar and the pages are linked to, so they drop down) and as far as I know, it's not supported. I'm moving my site over (slowly!) from SS5 and this wasn't supported then, and it's not been added as a new feature in SS7. I've had a hunt for code and I don't think there are easy solutions, either. If someone knows better I'll be glad to be proven wrong!