# Revert stack imports into CloudFormation StackSets
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If you have unwanted changes in your stack instance, you can revert the stack instance import.

When you revert a stack instance import, CloudFormation deletes the stack instance from the StackSet but retains the stack's resources.

To revert a stack import operation, complete the following procedure.

1. Specify a `DeletionPolicy` attribute of `Retain` for each resource that you want to keep after the stack instance is deleted. For more information, see [Reverting an import operation](resource-import-revert.md).

1. Delete stack instances from your StackSet. For more information, see [Delete stacks from CloudFormation StackSets](stackinstances-delete.md).

1. Delete your StackSet. For more information, see [Delete CloudFormation StackSets](stacksets-delete.md).