Effective management of inventory and configuring user roles are essential for optimizing the functionality of QuickBooks Desktop. Let's explore some different avenues to overcome this challenge, Chuck S.
 

If the issue pertains to user roles, you can modify and configure these roles to better align with those that have the permissions necessary to add notes to item lists. This adjustment will ensure that the right users have access to perform this function effectively.
 

You can follow these steps to edit users role:

1. Go to Company
2. Hover to Users then select Setup Users and Roles.
3. Then select the users then hit Edit. 
   
4. Choose role in the Available Roles and click Add button to add the role into Assigned Roles box.
   (Every role available have description below to know what privileges they can do)
   I recommend the Inventory role for tasks related to inventory management, or the External Accountant role, as it has permissions equivalent to those of the admin.
   
   
5. Click OK.
    

Also given that you have already verified and rebuilt the system to address this issue, I strongly recommend upgrading your QuickBooks Desktop to the latest version. Updating to the most recent version can significantly enhance your inventory management experience, particularly in terms of the functionality for adding item notes.
 

Moreover, if the problem persists, I recommend using the QuickBooks Tool Hub. This comprehensive utility offers various tools designed to troubleshoot and resolve common issues encountered in QuickBooks Desktop. It can ultimately streamline your troubleshooting efforts and enhance your overall software experience. Here’s a guide on how to download and install the QuickBooks Desktop Tool Hub; please follow steps 1 and 2 in the article.

Additionally, you can check how to set up landed cost in QuickBooks Desktop, landed cost helps you track the true cost of your products by including extra expenses like shipping, customs, and insurance. Once set up, you can see the total cost for any inventory item you receive, giving you a clearer picture of your actual expenses.

I've included these article that may help you in the future: Use item categories in QuickBooks Desktop Enterprise.

We're here to assist you enhance your inventory management, making it more efficient and informative Chuck S. Don't hesitate to ask if you have any additional questions – we're always here to help.