The joint is deleted from your scene and the bone of the joint above the removed joint now connects to the joint below the removed joint.
If you removed a joint from the skeleton of a bound character, the character’s bind pose automatically adjusts and its skin history is retained.
To remove a parent joint and all its children
-click
the joint and select Actions > Unparent from
the marking menu that appears.
The bone between the current joint and its parent joint is removed.
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The current joint and all its child joints are deleted from your scene.