Houdini Stuff

  There's a Look At Constraint, in the Constraints tab, however if you only want this aim to work on the X, or maybe just the Y, you hav...

Use the julian matrix - (point wrangle) matrix M=detail(1,"xform"); @P=@P*M; plug the transform you want to "copy" into ...

group centre/centroid - intstead of blasting out groups and using $CEX etc, you can just use $GCX, $GCY, $GCZ in your transform pivots.

press INSERT!