Mainframe, MVS and zOS Discussion

I need to merge two members of a PDS. For example, assume the PDS is ABC.EFG(X) and ABC.EFG(Y), these two after merge give ABC.EFG(XY). I used IEBCOPY but I was not to make it go. Even though I looked at some examples online. I just want to copy the content-of-member-X and content-of-member-Y one af...