I'm having trouble understanding the purpose of extending the Form object.

I thought creating a form Subclass would allow me to call it from any PageType, I'm trying to create a form that I can use on it Originally Intended page type as well as a Virtual Page

Below is the as it exists on my original PageType

function UserProductReviewForm() {
      // Create fields
      $fields = new FieldSet(
		 new TextField('Name','Name:'),
		 new EmailField('Email','E-Mail Address:'),
		 new TextField('Location','Location:'),
		 new OptionsetField('Rating','Rating',array(
			'1' => '1',
			'2' => '2',
			'3' => '3',
			'4' => '4',
			'5' => '5',
		 )),
		 new TextField('Title','Review Title:'),
		 new TextareaField('Review'),
		 new HiddenField('ProductID', '', $this->ID),
		 new HiddenField('ProductName','',$this->Title)
      );
      // Create actions
      $actions = new FieldSet(
         new FormAction('doReview', 'Submit')
      );
 
      return new Form($this, 'UserProductReviewForm', $fields, $actions);
   }

And the New Custom Form

class NewReviewForm extends Form {
	/**Create Review Form****
	************************
	************************/
	function __construct($controller, $name) {
      // Create fields
	  //$recaptchaField = new RecaptchaField('MyCaptcha');
	  
	  
      $fields = new FieldSet(
		new TextField('Name','Name:'),
		new EmailField('Email','E-Mail Address:'),
		new TextField('Location','Location:'),
		new OptionsetField('Rating','Rating',array(
			'1' => '1',
			'2' => '2',
			'3' => '3',
			'4' => '4',
			'5' => '5',
		),
		new TextField('Title','Review Title:'),
		new TextareaField('Review'),
		new HiddenField('ProductID', '', $this->ID),
		new HiddenField('ProductName','',$this->Title)
      );
      // Create actions
      $actions = new FieldSet(
         new FormAction('doReview', 'Submit')
      );
	  
	parent::__construct($controller, $name, $fields, $actions);
	
   }

How would I call this form in template?
And where do I define the new Action?

Thanks

Well you would need to have a function on your page controller to load the form like

function UserProductReviewForm() {
 return new NewReviewForm($this, 'UserProductReviewForm');

And you can then include it in the template with $UserProductReviewForm.

Your submission method would go on that same Page_Controller.