There are a few ways to edit an existing stock item in vintrace.
You can edit stock items from:
Winery Setup Edit
The Winery Set-up> General stock items or Wine stock items
Stock item Overview Edit
The Stock item Overview > Search> Stock item overview
The Sales tab on the stock item (This only applies if the Sell this item option is checked).
The basic edit of a stock item will be updating the Stock code, Name, Description, Category and the other fields that are accessible.
You may come across needing to change the Unit or Tax Class on the Stock item. In this case this section will be gray'd out. If you run into this, you will need to rename the Stock item name slightly (adding Inactive to the end will work) and set this item to Inactive. Setting this item to inactive will allow you to re-use the original name and allow you to make the necessary changes.