When you click Gameplay > Animations in CK, you'll see an "Idle Animation" window, containing entries like Actor\Character\Behaviors\0_master.hkx

What I want to do is to copy the whole entry of this Actor\Character\Behaviors\0_master.hkx. I don't care if it ends up as *originalID*-DUPLICATE or something. I just want to duplicate 'em.

I know that I can actually "Copy" a child of the child of the root entry, but... I was wondering if there's actually a "faster" way. because when I try to paste a child, the pasted information becomes the child of the last item I click. A bit different from my expectation

EDIT:
I find that, if I merely copy them they'll be deleted by the time I open it up again, perhaps because they have "DUPLICATE0000" at the end. But there's a case in the default 0_master.hkx with DUPLICATE000 and they're not deleted. How so?