You can archive Costbook items to remove it from the list of available items and still preserve it for historical purposes.
Here is one example of the steps to take to archive a Costbook Item, which can be followed for Misc. items.
1. Click on the Labor Type you wish to archive to open the edit screen.
2. Uncheck the Active checkbox.
3. Now you have 2 options after you edit the item:
• To close the edit screen, click Save & Close
• To discard the edit, click Cancel.