Sell gift cert with custom fields help?

I want to sell gift certificates via Virtuemart. But I don't want to create product for each gift cert value. Can I choose gift cert value with custom fields help?
Example: I choose product - gift certificate, and I can select in dropmenu or radiobox value of it. After receive it on email.
How to make it?

Hello,

You can sell gift certificates in a dropdown in the front end, but you would still need to set up a product for each within AwoCoupon. The idea is to create a parent product called Gift certifiicates, and then create children products, where each one is a value. Tie these products to AwoCoupon and then you can use stockable variant to add the child products into a dropdown.

Here is virtuemarts explanation:
http://dev.virtuemart.net/projects/virtuemart/wiki/Product_custom_fields_with_stock_control

And another tutorial:
http://www.flexiblewebdesign.com/forum-virtuemart-2-template-puremart-support/152-tutorial-custom-field-with-stockable-variants