hiiii
You can create a drill down group in list box with Region - Country - City,materialid as per your fields.
Do this at Settings - > Document Properties - > Groups
After you have created the drill down group you can use that group as a list box.
The list box will drill into the next field after a selection is made.
this will treated as multibox but i never tried to use this drill down or cyclic in multibox for my convenience it is not possible in multibox
