You will only get one invoice from AWS per Organization.
However there are multiple ways to generate reports and break down cost and usage data.
Use Tags and Cost Categories to generate reports in the cost explorer: https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/manage-cost-categories.html & https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/cost-alloc-tags.html
Use Billing Conductor: https://docs.aws.amazon.com/billingconductor/latest/userguide/what-is-billingconductor.html
Check out the Lab that shows how to integrate Organizational data with your cost and usage report data: https://www.wellarchitectedlabs.com/cost/300_labs/300_organization_data_cur_connection/
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