Q: "I am in Setup and have imported my Items.  I don't see a way to add missing Items."
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 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.