You can define cant for a rail subassembly by defining cant parameters on the Cant Tab. When you define the LeftRail and RightRail parameters, the Subassembly Composer treats the subassembly as a rail assembly and cant values will be applied to it. After you select the ApplyAOR check box in the Properties panel for links to which you want to apply cant, you will see the cant effect in the Preview panel in Carriageway Mode.
To ensure that cant is calculated correctly, ensure that the origin (indicated by 
) that is shown in the Preview panel is at the center point between the left rail top point and the right rail top point, as shown in the following illustration:
You can import a rail subassembly into Autodesk Subassembly Composer to see the cant effect in the corridor section view. You can adjust the values of the cant parameters after you import the subassembly into Autodesk Subassembly Composer. To ensure that cant is calculated correctly, ensure that the track width value in the rail alignment properties is the same as the actual track width of the rail subassembly.