Group node in shader graph

hi all,
I am making HDRP shader using the shader graph. I want to keep the technical parameter in group but I do not understand that how could we do that.
please let me know if there is any group node available bin shader graph.
I am using unity 2018.4.9

What do you mean exactly?

You can select multiple nodes, right click and put them in a group.

You can also select multiple nodes, right click and turn them into a subgraph.

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The group node is available in newer versions, you will have to upgrade into the 2019 editor tech stream to see that functionality.