Assuming you want to open Thunar via Directory Menu on folder ~/AAA/BBB 
one have to walk/click 'Directory Menu' --> AAA --> BBB --> Open Folder

An enhancement would be to support double-click on any folder item to open it:
"Direcory Menu"  --> AAA ==> BBB     (where B is double-clicked)

This would be about 30% faster for opening a 2nd level subdir ;-)