Yes I am aware of this but it is not what what I was talking about.
Subject: for example when hunting for the last 4 GZ markers, I was hoping to find a link command to be able to go directly to the main GZ floor whithout having to link through Relto and/or Nexus books.
I now understand it is almost impossible unless we could find the Nexus command line that could link us to Rezeero.
I do understand your path: link to GZO and use the flymode to drop down on the main floor. It is a good trick.