Implement a tag policy with the allowed project tag values in the organization's management account. Additionally, create a Service Control Policy (SCP) that restricts the cloudformation:CreateStack API operation unless a project tag is included. Apply this SCP to each Organizational Unit (OU).

Establish a tag policy with the allowed project tag values within each OU. Furthermore, devise an SCP that prohibits the cloudformation:CreateStack API operation without a project tag. Attach this SCP to each OU.

Develop a tag policy with the allowed project tag values in the AWS management account. Also, create an IAM policy that denies the cloudformation:CreateStack API operation if a project tag is not present. Assign this policy to all users.

Leverage AWS Service Catalog to manage CloudFormation stacks as products. Utilize a TagOptions library to regulate project tag values and share the portfolio across all OUs within the organization.