The Billing Exports app can be filtered to show lines for a specific billing platform.
This can be done from the menu in the top-right of the screen.
It's possible for the Billing Exports app to auto-select a particular Billing Platform when launched.
To configure this, administrators should access Settings - Billing Platforms, then select the desired billing platform.
Check the Default box to enable this.
When this is checked, it will be unchecked for any other platforms.