GCP costs are not flowing from Partner level to channel customer level via Partner Generated Billing (PGB).
PGB processing system will not pick Billing Account (BA) for bill splitting at channel customer level if the BA is NOT showing as Master Billing Account. In this case Cost History will not get updated at channel customer level.
You can verify if a BA is a Master here: https://apps.cloudhealthtech.com/gcp_billing_accounts
The solution is to configure a data connect using GaphQL api at the partner level according to:
https://help.cloudhealthtech.com/graphql-api/#create-data-connect
Once data connect is configured correctly, the Billing Account derivation job will mark the Billing Account as Master Billing Account. Following that action, the PGB processing system will start bill splitting for the channel customer. This should update Cost History reports at channel customer level.
Note: After creating Data Connect, CloudHealth will only recognize the automatically derived Billing Accounts. Therefore, do not manually add the Billing Accounts in the CloudHealth platform