Existing discounts will not be migrated to the new Cloud billing account under CNTXT or your chosen authorized Google Cloud reseller. CNTXT or your chosen Google Cloud reseller will enter into a new contract with you with new terms and conditions.
In addition, invoices and payments information, including tax information from your old Cloud Billing accounts, will remain available on the Payments profile where they were initially created. You will need to log into your old profile to access and view previous (pre-migration) invoices.
Google Cloud usage data that occurred on your old Cloud Billing account will not be migrated to the new Cloud Billing account. You will need to log into your old profile to access and view prior (pre-migration) usage data.