A method, apparatus, and article of manufacture provide the ability to update a slope of a run in a system in a computer drawing application. A system run (i.e., an interconnected series of objects) is selected in a computer drawing application. The objects in the interconnected series are part of the same system and the series has a starting point and an ending point. A property for a slope of the system run is specified. The slope of the system run is updated across all of the interconnected series of objects based on the specified property.