A. For each project and environment, create a new AWS account and link them to the master payer for unified management and billing
B. Use AWS Organizations to create a new organization for each project, then for each environment use a separate linked AWS account
C. Implement cost allocation tagging in the Billing and Cost Management console to implement tags to identify resources by project and environment
D. Add the project and environment information to the instance metadata so that the values can be queried and rolled up into reports