I have a query from a Water Distribution client I am building UN for. The client wants to flag the "storage unit" device as a "subnetwork controller" for System and Pressure tiers. However, some towns have multiple storage units and all are valid water sources for that town. Is there a way to flag multiple storage units as subnetwork controllers? My understanding is validate and update subnetwork will flag this as a problem as a trace from one subnetwork controller (storage unit A) will lead to another subnetwork controller (storage unit B). Is there any workaround?