How Do I Transfer an Existing Project?
To migrate a project into an organization:
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Open the IAM & admin > Settings page in the GCP Console.
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On the Select organization drop-down list at the top of the page, select No Organization, and then select the project you want to migrate.
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At the top of the page, click Migrate.
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On the Organization drop-down list, select the organization you want to migrate your project to.
After a project is added to an organization, you cannot undo the selection on your own.
For more information look here.