You can clone with
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@prehfeldt: 'It would be great if you could enter a list of nodes (comma separated) in the "From node" and "To node" fields of the "Add Relationship" dialog and every node in the from field gets linked to every node in the to field.'
The preferred way to mutate the graph is now entirely from within Cypher. The new iteration of the Neo4j Browser GUI has brilliant support for adding multiple releationships at the same time via Cypher :)