Q: "I am in Setup and have imported my Items. I don't see a way to add missing Items."
(3572)
A: Setup offers the option of Importing OR Manually Entering your Items, but not both. To add Items, open your import file in a spreadsheet (e.g. Excel) and add the necessary Items. Be sure to save the file as tab-delimited text.
From the Setup Checklist, open Items and click the Delete All button. Import your updated Item List.