Available with Standard or Advanced license.
- Add your network feature classes to ArcMap.
 - Click the Editor Toolbar button 
 on the Standard toolbar.
 - Click the Editor menu on the Editor toolbar and click Start Editing.
 - Zoom to the area where you want to add the new feature.
 - In the Create Features window, click the type of junction feature you want to create, and click the Point construction tool.
 - Click Customize > Toolbars > Snapping.
 - Activate Vertex Snapping and deactivate the other snapping options.
 - Move the pointer near the junction you want to subsume with a new junction until the pointer snaps to it.
 - Click once to subsume the junction. 
The original junction is deleted and replaced with the new junction; network connectivity is maintained.