You can use alignment settings to specify the default behavior for alignment commands.
Settings are handled in a standard way throughout Autodesk Civil 3D. You access settings using the Settings tree. Control settings at three levels: the drawing level, the object collection (feature) level, and the command level.
Use the Settings tree Alignment collection context menu to establish defaults for all alignment commands. You can change alignment-specific settings at this level, such as Station Indexing and also override the drawing ambient settings.
Use the Commands collection under the Alignment collection to change alignment settings for a specific command. You can change alignment-specific settings at this level, or override the drawing ambient settings. Expand the Alignment Commands collection, on the Settings tab, to display a list of commands for an alignment. Right-click a command name and click to open the Edit Command Settings dialog box for the command. Change the settings as needed.