Billing Group Percentage Custom Line Item

This template creates a percentage charge custom line item that is 10% of the billing group total cost. The custom line item is created through CloudFormation and has a description of 'Test percentage custom line item created through CloudFormation for a %10 additional charge on the overall total bill of the billing group.' The billing group ARN is obtained using the `Fn::GetAtt` function. The custom line item charge details specify a percentage value of 10 and a type of 'FEE'. The child associated resource is set to the billing group ARN.