Only just starting out with away3d&lite so may be way of the mark :/
something like
reparent(sphereA, container2);
private function reparent(ob:Mesh, newParent:Mesh):void
{
var newParentMatrixCopy:Matrix3D = newParent.sceneMatrix3D.clone();
newParentMatrixCopy.invert();
var obMatrixWorld:Matrix3D = ob.sceneMatrix3D.clone();
newParentMatrixCopy.prepend(obMatrixWorld);
ob.transform.matrix3D = newParentMatrixCopy;
ob.parent.removeChild(ob);
newParent.addChild(ob);
}
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