I'm not 100% sure what the question is, but I will attempt to answer it.
You can add rows to the C_SubnetworkControllers table in the asset package to define the subnetwork controllers that will be created when you deploy the asset package. If you export a utility network that contains subnetworks to an asset package, this table will be populated with the controllers that were in your utility network.
Tracing requires a utility network, so you won't be able to trace the subnetworks that until you deploy your utility network and resolve your errors.