Parallel routing is useful when laying out hot and cold piping systems, pipework for radiant heating systems, or conduit runs. One technique for designing parallel routing involves laying out a single run and then offsetting a specific distance from other segments relative to the original segment or from existing geometry, such as a wall. In this scenario, you add one segment at a time.
In AutoCAD MEP you can simultaneously route parallel runs. This alternative ensures that the turns are properly calculated by the software and that conflicts in the run can be prevented.