If you can have a “Parent,” and you can have a “Child,” why not have a “Sibling” company to indicate those who have a common parent?
Bottom line, I’ve got ten medical practices all owned by the same company. When I’m looking at one, I want to be able to “go sideways,” see the others, and navigate to them from within the company record. And then RETURN to where I was. I don’t want to have to go up one level, go down, go up, go down, etc.
Creating a shell company to be the parent and hold all the others might work for some, but for me it’s just clutter. Plus, I would still have to navigate up and down.