The correct options are Convert an existing repository into a template repository and Create a new repository from a template repository.

GitHub allows you to mark an existing repository as a template in the repository settings. This turns the project into a reusable starting point so teams can generate consistent repositories without copying by hand. From that template, you can generate a brand new repository that copies the directory structure and files which accelerates onboarding and keeps layouts consistent across teams.

Delete all repositories that originated from a specific repository template in a single step is not supported because GitHub does not provide a bulk deletion feature tied to template lineage. You would have to remove repositories individually or automate this with scripts or the API.

Create a new organization from a repository template is not possible because templates apply to repositories only. They do not create or configure organizations.

Remove every repository in the organization that does not use an approved template is not a supported action. GitHub does not offer an automatic cleanup or enforcement feature that deletes nonconforming repositories across an organization.

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