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For curve features, try using Copy to Layer instead. If that doesn't suit you, Composite Curve then remove the parameters.
There are probably other ways around getting rid of the parent/child stuff but those come to mind first to me.
NX 188.8.131.52 MP11 Rev. A
GM TcE v184.108.40.206
GM GPDL v11-A.3.5.1
The Move Object command (icon in Utilities group of Tools tab in Ribbon Bar) also includes copy capability. Note that objects being copied are always non-associative. But for duplicating curves such as the spline in your example, this approach is fine. Copy as many as you want and there is a very robust selection of move methods available.
BTW, a couple years ago, I published an article on our Swoosh blog page that is a thorough study of all the different ways you can duplicate geometry in NX. Entitle "Ground Hog Day All Over Again", it is a 2-part series that first compares and contrasts the different commands in NX that "copy" and the second part provides tangible, statistical evidence of the use and effectiveness of all of the methods in a practical example. Here is the link but you will need to sign up to our Swoosh Customer Portal (free) to access it.