Moving an element to the top of the hierarchy

Unity Engine
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1

I’m trying to drag an item. However, BringToFront only brings the element to the front of its siblings.
I know some tutorials made use of a “ghost” element at the top of the hierarchy. I was wondering if there was a way to move an element up the hierarchy. I don’t see a way of setting the element’s parent.

2

I believe I may have answered my own question. It appears you can do it by getting the root element to call Add and pass the element in question.

3

We have BringToFront and its opposite SendToBack if you want to bring it to either end of the children hierarchy.
We also have PlaceBehind and PlaceInFront, if you know the sibling element that needs to be under/on top.
Or like you said Add can do the trick, or Insert if you want more control over the position.