See /editor :)

How to use:

MAJ + DRAG to select multiple nodes, then G to group them.
UV nodes CANNOT be grouped at this time
When selecting a node group or when inside it, press N to bring up its settings.
You can create your own, editable copy of any node group by opening its settings sheet and pressing "Copy & Edit".
Nodes with are a node group. Click the button to enter said node group.
Select a node group and press Enter to enter it.