@sanjaykz, you are a victim of using Manager in a way never intended. Changes were introduced to prevent problems and I am fairly confident they will not be undone.
What you refer to as the “inventory item” is actually the Item Code for an inventory item. Inventory items also have an Item Name and Description. Item Name is what appears on most reports. Description is meant for customers and suppliers to see and contains more detailed information. If no Description is entered, Item Name will appear instead. See the Guide:
https://forum.manager.io/t/inventory-items/7551
Looking at your screen shots, your Item Names and Descriptions do not seem very informative. If you used the three fields as intended, I think you would find Manager’s built-in forms and reports much more useful. In fact, I see no reason at all why you should be going through all this exporting to Excel, no matter how often you send invoices or statements.