You build an assembly from the Home tab by choosing Assembly Figure 8-5.Create Assembly from the Create Design panel. The result is the main assembly baseline. This is the point on the assembly that gets “hooked in” to your design alignment and profile. A typical assembly baseline is shown in
When an assembly is created, you have the option of telling Civil 3D what type of assembly this will be:
These categories will help the software determine the axis of rotation ...