title: Being able to have multiple items in Django
body: <p>I'm making a system that keeps track of all the orders a customer orders looking at products, purchase date, price, etc.</p>
  
  <p>If I want to be able to allow the user to, say, purchase more than one product...(i.e. 5, 20, 323523). How can I allow the user to add more products?</p>
  
  <p>Here's the code I have:</p>
  
  <pre><code>class PurchaseOrder(models.Model):
      product = models.CharField(max_length=256)
      vendor = models.CharField(max_length=256)
      dollar_amount = models.FloatField()
      purchase_date = models.DateField()
      notes = models.TextField( null=True, blank= True)
  </code></pre>
  
  <p>I want it to where</p>
  
  <p>When I'm at the add page:</p>
  
  <p><a href="http://i.imgur.com/u1pu1Gp.png" rel="nofollow">http://i.imgur.com/u1pu1Gp.png</a></p>
  
  <p>I can add more than 1. Would this be a foreign key relationship? How would I go about implementing that?</p>