PFE is a great program and essential tool, BUT it is not an easy program to use to do what you are trying to do.  It is very particular in how it nests in a Paste, and that is the basis of what you want to do.

It is more easily done using a text editor - one that does not add formatting of its own - I use EditPad Lyte.

The down side - Poser does not forgive mistakes in { } placement.  It does not tell you what or where those mistakes are - it just says that the file is not a Poser file.  PFE keeps track of { }  and collapses the trees so that the endless scrolling in a simple text editor is avoided.

Open your CR2 in PFE.

Navagate to 2nd instance of " actor BODY "

 channels

groups

Look at how groupNode xxx are arranged and how they are displayed in Poser.

Experiment with your changes until you get the display that you want.

You can try to use PFE to CUT/PASTE, but I usually wind up with the paste in the group tree one level too high, so it do it directly in my text editor.  Just understand, one misplaced { or }  and the file will not work.