How can I bring back/restore deleted items from the items list.

There's no undo for deleting an item.

But also there's no way to delete an item that has been used, and so if you can delete an item that means it did not / does not impact any reports.

If you want the item back, add a new item to replace the one that was deleted.

Hello, @0074.

Items that were already used in any of your transactions will not be deleted. It will be marked as inactive. Let me guide you in restoring its status.

1. Go to the Lists menu.
2. Choose Item List.
3. Make sure to mark the Include Inactive in the Item List window.
4. Locate the deleted item.
   • You can also see a x mark beside the name of the deleted item.
5. Right-click on the item name.
6. Choose Mark Item Active. 

Also, you can restore the backup copy of your company file before the items were removed. 

Keep me posted if you have other questions about managing your company file. I'm always here to help.