Recall this option is not suitable for editing any data prior to running the simulation, to do this you must Load the urban network.
To load an urban simulation independently of the network, on the Simulation tab, click Load Simulations. Alternatively, from the Project Panel, right-click on Simulations and select Add Item from the menu.
Note: If you’ve added an urban simulation only and now want to view the associated urban network, right-click the simulation and select Set Active from the menu.