copy nodes between different materials

when i have set up two different complicated materials (in cycles) and now want to copy a subset of nodes (with their connections and settings) from material 1 into material 2, so that i do not need to recreate the node structure manually one by one, how can i do this ?

another questions along similar lines : when i have set up 2 materials, can i make material 1 to be a subset of material 2 ?

Add the selected nodes to a group (Ctrl+G) and add that group node to the second material node layout

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thanks a lot ! yes works exactely as i wished ! wonderful