Set Advanced CSV Import Options
On the Import Options page, expand the Advanced Options menu to set preferences for your current import job. The following advanced options are available:
Some of these options are also 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 a single import override the general preferences from the CSV Import Preferences page.
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, so you don’t accidentally change something to a default value.