Embedded SystemGraph node
It's possible to use an existing SystemGraph asset as a node in another SystemGraph. You can connect edges to property ports of the embedded SystemGraph node as if it were a standard runtime node; you can also have an unlimited number of levels on an embedded graph.
The ports that appear in the node view are the properties of the selected SystemGraph asset.
SystemGraphComponent Instance is a binding that can be set in the Inspector window of the current System Graph Component. Setting this binding links the embedded graph node with an existing graph in your scene.