I created a Parent rib in a plane parallel to the Front plane. I then mirrored that feature about the Right plane, creating a Child rib. I have been trying to find a way to further mirror the Child about the Front plane, but without also mirroring the Parent. I appreciate that I could have created a separate rib in the first place, rather than mirroring the original rib. However, I am just trying to explore options. 

Am I correct in coming to the conclusion that it is not possible to copy only a Child feature without also copying the Parent? 

Thanks in advance.