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You would expect that you could select a Maven project node, or an artifact node in its Dependencies list, or an artifact version node in the repository browser, and copy it or drag it onto the Dependencies (Test Dependencies, etc.) node of another Maven project to add a dependency. Currently no such copy/drop is allowed.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss