Electrical Design > Using Notes in Diagram > Reference Zones and Parametric Notes
  
Reference Zones and Parametric Notes
Reference zones are designated areas of a diagram drawing in which views of multiple-view components (MVC) can be cross-referenced using parametric notes. These notes are used primarily in the construction of ladder diagrams.
A reference zone consists of either horizontal or vertical division lines, each of which is assigned an index or line number. You first determine the physical size of the reference zone and then specify the starting index and delta.