On the "Import Settings" tab in the Settings area of the sitemgr, you can setup some import options:
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1. Import CSV comes from an Export: If you previously did an export from the import / exporter on your eDirectory installation - please check this box. 
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2. Enable all imported items as Active: Rather than having imported item in pending mode (so you can check them over and add data) this check box will make all imported items instantly active on the site. 
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3. Overwrite matching items: If you want to update an existing item in your eDirectory you must check this option.  For an item to be considered a match the following field must be identical on the imported .csv file and the database: Listing ID/Event ID.
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4. Update friendly URL's for matching items: It is strongly recommended that this option be left unchecked. If we find a record in the .csv file with a matching Listing ID/Event ID when compared to an existing record in the database, we will update that item with the new data (as detailed above), but with this option on we will also rewrite the URL based on the item title. If you have content that has been indexed by google, this content will cease to be reachable from the search engines until they update their data - this can take a day or months. Use Carefully. 
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5. All new categories set to featured: All categories that are imported will be automatically set to featured. 
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6. Default level for items without level specified: For all items with no level specified in the .csv file, you can choose a level here..
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7. Import all items to the same user account: Everything in the .csv file will be attached to a single user account. After ticking this box, a dropdown will appear só that an account can be selected.