Multi-category & sub-category navigation

Is there something that can already do this before I reinvent the wheel?

I would like to have categories like:

600g Reef Aquarium (where something like weight=1)
210g FOWLR Aquarium (where something like weight=1)
150g African Cichlid (where something like weight=1)
55g Shark Aquarium (where something like weight=1)
and
Fish (where something like weight=2)
Inverts (where something like weight=2)
Lighting (where something like weight=2)

Then article <1> in “600g Reef…” & “Fish”
Then article <2> in “600g Reef…” & “Lighting”
Then article <3> in “210g FOWLR…” & “Fish”
Then article <4> in “150g African…” & “Fish”

And then have the navigation menu come out like:

———–
Catetories
———–
– 600g Reef Aquarium
+ Fish
+ Lighting
– 210g FOWLR Aquarium
+Fish
– 150g African Cichlid Aquarium
+Fish
– 55g Shark Aquarium
–