Cloudformation Nested Stacks

• Reusability of existing templates can be acheived by nested stacks Refer Here
• Refer Here for nesting an existing stack
• Create a template with nested stack. Refer Here for the changes
  
• Refer Here for the example with nested stack with parameters

Stack Sets

• Refer Here helps you in applying infrachanges across different regions and accounts.

Deploying cloudformation from cli

• Refer Here for the sample cmdline

• Reexecute this command to handle the updates aws cloudformation deploy --template-file main.json --parameter-overrides 'vpccidr=10.101.0.0/16' 'archname=fromcf-cli' --stack 'fromcli'
• Refer Here for transform macros.
• note: Refer Here
• Note: AWS has supported CDK on terraform Refer Here