Set Advanced CSV Import Options
On the Import Options page of the Import Assistant, you can expand the Advanced Options menu to set preferences for the current import job. The following advanced options are available:
Some of these options also are available on the CSV Import Preferences page, where administrators and other users with the Set Up CSV Preferences permission can set preferences for all imports. For more information, see Setting CSV Import Preferences.
Advanced Options settings for an individual import job override the general preferences set on the CSV Import Preferences page.
As of Version 2010 Release 1, the Use Conditional Defaults option is no longer available. Now, imports always populate dependent field values automatically when related field values are set, in the same manner that dependent field values are populated in the user interface. For updates, be sure to include all necessary values in CSV files, to avoid inadvertently changing existing field values to defaults.