I want to adjust a stock item value only not the quantity?

I'll be happy to guide you in adjusting the value, trayemiddleton. 

You can go to the Product and Services tab and edit the cost or price of the stock item. Here's how to do it: 

1. Select Sales from the sidebar menu.
2. Go to the Products and Services tab.
3. Locate the item you want to adjust, then select Edit from the Action column. 
4. Enter the desired cost or price. 
5. Click Save and Close to complete the process.

If you need to change the number of units in stock or mark them as non-sellable due to damage and other reasons, you can read this article to be guided in adjusting your inventory: Adjust stock quantity on hand. 

You can always go back to this thread if you have additional questions or concerns. The Community is always here for you.