Currently there is no built in functionality to suppress the FACILITY specific audit entries from a TSSUTIL CLASS(O) audit report.
This type of custom report can be achieved by a user written or 3rd party reporting application.
A TSSUTIL EXTRACT CLASS(O) can be run to create a dataset with audit entries.
Then you user written reporting program on 3rd party reporting application can use the dataset as input to generate the custom report by excluding FACILITY audit entries.
TSSUTIL is documented at: