An automated system, and method of operating the same, for interactively routing interconnections in a layout of an integrated circuit. Interconnections among subchips in the integrated circuit, specified by a netlist, are displayed by the system by way of airlines. The system provides a symbolic view of the bus, showing a representative wire of the bus, such as that associated with the least-significant or most-significant bit position in the bus. The physical routing of the representative wire is interactively defined, using orthogonal wire segments in selected conductor levels. Bus properties, for example including bit pitch, wire pitch, LSB/MSB, and a direction of expansion, are associated with the routing data for each segment of the representative wire. The combination of the routing data and the bus property data enable building of the entire bus from the interactive routing of the representative wire in the symbolic view.