Use subassembly settings to control the behavior of subassembly-related commands.
Work with subassembly settings the same way you work with other object settings in AutoCAD Civil 3D, using the Toolspace Settings tree. You can control subassembly-related settings at both the object collection (feature) level and at the command level.
Right-click the Settings tree Subassembly collection to establish defaults for all subassembly-specific settings and to override the drawing ambient settings for all subassembly-related commands. Use the Commands collection in the Settings tree Subassembly collection to override subassembly-specific settings or drawing ambient settings for a specific command.