In my example everything is set up manually to let you understand the underlying references between nodes/hierarchies. To set up a reference you simply drag the node gently with right mouse click close to the node you want to reference. If the node/hierarchy is far then you can use CTRL + ARROWS to move the node

P.S. It's better to pin the node you want to move so if you lose the focus the node will not come back to its original position

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