About editing geometric network features
This topic applies to ArcEditor and ArcInfo only.
While network features can be both created and edited in ArcInfo and ArcEditor, they are read-only in ArcView.
Geometric network features store various mechanisms and behaviors that maintain the topological connectivity between them. ArcMap is tightly integrated with the geodatabase when it comes to editing network features.
You can use ArcMap editing capabilities to create new network edges and junctions. By using the ArcMap snapping environment, you can create these features while maintaining network connectivity on the fly.
Geometric networks that are projected on the fly cannot be edited within ArcMap.
Network feature classes can participate in composite relationships with feature classes within the same geometric network, provided that the features are not connected.