# Sub-Layers
SubLayerName
id: 20
type: sublayer
display_name: SubLayerName
sublayer_index: 0
hidden: yes
I'm not sure if id and hidden attributes are needed.
In groupings.txt I had to use the following pattern:
Root
Layer1
Layer2
SubLayer1
Part1
Part2
...
SubLayer2
Part8
Part9
...
Part1
Part2
...
Part8
Part9
...