I don’t believe there is a way to create the deprecated Model Hierarchy via the GUI anymore.
There’s some discussion here:
I don’t recall that anyone worked on adding Subject Hierarchy support to the CLIs, probably because, as I mentioned, writing the CLI GUI in XML always resulted in clunky interfaces for anything other than the simplest workflows. I don’t think it would be hard to write a better GUI for the tractography measurements module (at least that’s what I’d do if I wanted to work on this).
@jhlegarreta note that with the Data Module you can right-click on a folder and choose Export to file and save all contents to a temp folder and then run the tractography analysis on them.