Hi,
A given report request can only include data from a
single AdWords account. However, you can use the
parallel_report_download example to download reports for all accounts directly under a manager account in parallel threads. This example uses
ManagedCustomerService to get a list of accounts under your manager account and then spawns multiple threads to download reports for these accounts. Example code in other languages are available
here.
Regards,
Shwetha, AdWords API Team.