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Manual copy-paste
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Nested stacks
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-nested-stacks.html -
Cross stack references (or export/import)
https://aws.amazon.com/blogs/aws/aws-cloudformation-update-yaml-cross-stack-references-simplified-substitution/ -
SSM parameter store
https://aws.amazon.com/blogs/mt/integrating-aws-cloudformation-with-aws-systems-manager-parameter-store/
https://aws.amazon.com/blogs/mt/using-aws-systems-manager-parameter-store-secure-string-parameters-in-aws-cloudformation-templates/ -
Stack sets
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/what-is-cfnstacksets.html -
AWS CDK
https://aws.amazon.com/blogs/developer/aws-cdk-developer-preview/