Hello, @PLAEUSA.
Thank you for taking the time to reach out to us here on the Community page.
I understand the importance of being able to lock down or free the costs of your items from changes on the Item List in QuickBooks Desktop. This feature is currently unavailable as of the moment. Rest assured our engineers are continuing to develop QuickBooks to deliver the best experiences for customers like you.
For now, I encourage visiting our blog to stay current with our latest QuickBooks news and updates. Here's the link: Product Updates.
As always, feel free to skim through our help articles in case you need tips while working with QuickBooks in the future.
Do you have any other QuickBooks questions, @PLAEUSA. Mention me in the comment section below. I'm a few clicks away to help. Take care!