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Right click on the appropriate circuit, this will reveal one or both of the features in the dropdown list called Sub(s) and/or Add new …

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The Sub(s) option in the list reveal sub circuits related to this parent circuit – refer to the screenshot above containing one sub circuit (OS), which itself has a nested sub circuit (10G).

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The Add new … option will reveal any available free channel in which to create a new circuit that will utilize that free channel – see the screenshot below.