Select checkbox ng-if parent checkbox is slected, both parent & child is uncountable diff. array

Structure is

结构是

$scope.divisions = [
  { Description: 'test1', Id: 1 },
  { Description: 'test2', Id: 2 },
  { Description: 'test3', Id: 3 },
  { Description: 'test4', Id: 4 },
  { Description: 'test5', Id: 5 }
];

  $scope.subd = [
  { Description: 'sub1', Id: 7 },
  { Description: 'sub2', Id: 8 },
  { Description: 'sub3', Id: 9 }
];
$scope.divisions = [
  { D