Some subassemblies use a Side input parameter to specify inserting the subassembly on the right or left side of a corridor; other subassemblies allow you to do this by specifying a positive or negative value for the insertion point input parameter.
Subassemblies that contain a Side input parameter let you specify which side the subassembly is inserted by setting this parameter to Right or Left. By default, this parameter is typically set to Right. Change it to Left to insert the subassembly onto the left side.
The Auto-Detect Side command setting enables AutoCAD Civil 3D to apply the side parameter of the subassembly to which a new subassembly is attached. For more information, see Edit Feature Settings - Subassembly Dialog Box.
Other subassemblies, such as LinkOffsetAndElevation, do not contain a Side input parameter. However, you can insert the subassembly onto the right or left side of a controlling baseline by entering a positive or a negative value for the insertion point input parameters. A positive value for this parameter inserts the subassembly onto the right side of a corridor, or of a controlling baseline. A negative value inserts the subassembly onto the left side. The insertion point input parameter could be named any of the following, depending on the function of the subassembly: Insert Point Offset, Sample Point Offset, Daylight Offset from Baseline.
The following are examples of subassemblies that do not contain an input parameter named Side. For these types of subassemblies, you specify the side by using positive and negative values for the insertion point input parameter.
You can also use the Mirror option to automatically copy a subassembly, or multiple subassemblies, from one side of an assembly to the other.