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Can I import using external IDs?
When importing custom objects, solutions, or person accounts, you can use external IDs to prevent the import from creating duplicate records.
An external ID is a custom field that has the External ID attribute, meaning that it contains unique record identifiers from a system outside of Salesforce. When you select this option, the Data Import Wizard detects existing records in Salesforce with external IDs that match those values in the import file.
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