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Product Version = NetBeans IDE 7.1 RC1 (Build 201111242103) Operating System = Mac OS X version 10.7.2 running on x86_64 Java; VM; Vendor = 1.6.0_29 Runtime = Java HotSpot(TM) 64-Bit Server VM 20.4-b02-402 No option in Preferences for this Function.
This feature should be already implemented, in the keymap search for the actions: Copy Selection else Line down Copy Selection else Line up