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Set Up and Maintain Your Salesforce Organization
Undoing an Import

Undoing an Import

If you import accounts, contacts, leads, or solutions by mistake, your administrator can delete the items you mistakenly imported.

Required Editions

Available in: both Salesforce Classic and Lightning Experience
Available in: All Editions except Database.com
User Permissions Needed  
To mass delete data: Modify All Data
  1. As the administrator, enter Mass Delete Records in the Quick Find box from Setup,
  2. Select Mass Delete Records to delete the items were mistakenly imported.

The Mass Delete Records tools do not support custom objects. If you import custom objects by mistake in Enterprise, Unlimited, Performance, or Developer Edition, your administrator can use the Data Loader to mass delete the mistakenly imported records.

 
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Salesforce Help | Article