Reparent an Object
To reparent an object , you need to pick the object and drop it on the object you wish it to be parented in. The object will be removed from its current parent, and inserted in the new parent at the next available position.
When an object is inserted into a parent, it is always added at the next available position. If you wish to place an object at a particular position within a parent, you must hold down the Shift key, and drop on an object already contained in parent, Your object will then be inserted in the parent, in the position preceding the child object that you dropped on.