Bulk db insert with a file through admin form

Say I've got a model like this:

class Product(models.Model):

name = models.CharField(max_length=200)

class ProductItem(models.Model):

     product = models.ForeignKey(Product)

     serialnumber = models.charField()

     sold = models.BooleanField(default=False)

ProductItem represents physical products in the store.  I have a file with thousands of serial #'s for the product.  In the product form in the admin, I'd like to upload this file, parse the serial #'s and create rows in ProductItem.  I could add a FileField to Product and create a custom storage that parses the file and creates ProductITems.  Or I could override save for the Product model.  Both of these solutions are non-optimal, as I will have a FileField in Product and db that I don't need.

Is there any way to add a 'dummy' FileField just for the form that doesn't result in a DB row?  Or is the answer to create a custom admin form?  Any good tutorials or examples for doing creating a custom admin form?

Thanks,

Mark

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