[TYPO3] Trade Ext - adding new field to product

[Sandy Matheson]

I am trying to configure and customise the Trade extension and would
like any help with addiding additional fields to the description of a
product. I have added the field to the database table
tx_trade_products but I cannot work out how to add them to the Typo3
BE so that a user can enter the details. Once I can do this it will
also be easy to add them to a template, but I am stuck with adding
them to the product itself.

Any help gratefully received.

Sandy