Use this feature to track the usage of child accounts. This applies to accounts configured to use the customer hierarchy feature.
This feature collects the usage records from child accounts and applies them to the parent account. The parent account must contain a subscription with a matching unit of measure (UOM). All of the usage records are rated and billed from the parent account, even if you have set the child account as the invoice owner (see Invoice Subscription to Different Accounts for information about setting the invoice owner).
If the account in the example contains more than one subscription with a matching UOM, the usage records will be rated in all of the subscriptions as if the usage records were uploaded against the parent account.
Click your username at the top right and navigate to Billing > Define Billing Rules, and enable the Include usage from child accounts when billing? setting.