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This functionality is found in the Import/Export Format Editor.
When the target database and the source data include an identical record, it is handled according to the Check for Duplicate setting in the Field View on the Fields Tab. Specify a field to check for duplicates by selecting the check box next to that field.
Cartegraph only replaces duplicates for one exact match. If there is more than one duplicate found, that value is not overwritten. For example, if the import finds more than one record with the MUTCD Code of R1-1, these values are not overwritten and this is reported in the Job log.
If empty values should update and replace existing records, verify the Run Property for When an existing record is updated.
If existing records should be ignored without error, verify the Run Property for When a record exists is updated.