how to stop a sequnece and the deactivate that sequnce and the show the bom.

You can use a timeout function for that sequence. Below is a sample code:-

$scope.sequence1 = function() {
  $scope.view.wdg['model-1']['sequence'] = 'l-Creo 3D - ShoulderReplacement.pvi';
    $timeout(function() {
      twx.app.fn.triggerWidgetService('model-1', 'playAll');
    }, 2000);
  };
$scope.$watch('app.params.foo', function(val) {
  if (val === 'true' || val === true) { 
   $timeout(function() {
      $scope.sequence1();
    }, 2000);
  } else {
    $timeout(function() {
      $scope.sequencestop();
     }, 2000);
  }
});
$scope.sequencestop = function() {
  $scope.view.wdg['model-1']['sequence'] = 'l-Creo 3D - ShoulderReplacement.pvi';
    $timeout(function() {
      twx.app.fn.triggerWidgetService('model-1', 'stop');
    }, 2000);
  };