Can i change the value of a stock item that is in the stock?

Hi there, trayemiddleton. 

I'd be happy to walk you through how to change the value of a stock item in QuickBooks Online. 

Lets go to the Products and Services page and edit the value of the item from there. 

1. Go to Settings ⚙ and then select Products and Services.
2. Locate the non-stock or service item you want to change.
3. Select Edit in the Action column. 
4. Enter the correct Value of the item. 
5. Press Save and Close. 

If you need to adjust inventory quantity on hand, please check this out for additional guidance: Adjust stock quantity on hand in QuickBooks Online. 

Should you need help with anything else, you're always welcome to post again here in the Community. We're glad to be of your service. Stay safe!