It would be helpful if there was an easier way to see individual relationships of subsidiary organizations when you are looking at the parent organization's record (especially in regards to corporations). It would also be helpful to have examples of capturing the interconnectedness of corporations and their subsidiaries in the RE guides.
Just FYI, I find the "Parent Corporation" field on Org2 to be worthless. If you've got everything linked well on the Relationships tab then the Relationship Tree does a good job of "connecting all the dots."