Is it possible to perform a trace in a utility network with multiple domain networks?

Answer

It is possible to perform a trace in a utility network with multiple domain networks, as long as they share the same structure network. Set or modify the trace configuration in the subnetwork definition. Refer to ArcGIS Pro: Set or modify the subnetwork definition for steps to do so.

Note:
Ensure the Include Structures option is checked when running the Trace tool to include the structure features and objects in the trace results.