For example, if you are inserting Account records, you could specify a CSV file called insertaccounts.csv containing a Name column for the names of the new accounts. Click Next. After the object and CSV file are initialized, click OK. If you are performing an upsert, your CSV file must contain a column of ID values for matching against existing records. The column is either an external ID (a custom field with the External ID attribute) or ID (the Salesforce record ID).
For example, if you are inserting Account records, you could specify a CSV file called insertaccounts.csv containing a Name column for the names of the new accounts. Click Next. After the object and CSV file are initialized, click OK. If you are performing an upsert, your CSV file must contain a column of ID values for matching against existing records. The column is either an external ID (a custom field with the External ID attribute) or ID (the Salesforce record ID).