Enable Cost Explorer
AWS Cost Explorer must be enabled if you want Cloud Cost Management (CCM) to provide Bill Analysis reports. Regardless of the integration installation method used, Cost Explorer must be enabled from the management account, even if set up on a sub-account.
IAM Roles set up with the management account allow CCM to present reports spanning all of your accounts. IAM Roles set up with a sub-account only report cost for that one account.
Log in to your AWS management account.
Navigate to Cost Explorer.
Click Enable Cost Explorer.
The API is now available for use but has no data. You can request up to a year of cost billing data from AWS.
Next Step
Create a Cost & Usage Report in AWS