Hi Junghyo,
The road bank angle is not something you can input directly in the Vehicle Vehicle Composer app itself. Instead, you can provide that information directly in the model after you generate it. Once your model is built, go into the Environment subsystem and look for the Ground Feedback subsystem.
You can make your own variant in there, or modify one of the existing ones. For example, you could just modify the values in the constant ground height variant (the first variant in the Ground Feedback subsystem) so that the vehicle is at a constant tilt. If you want to go over time-varying terrain, you can add an input signal for the wheel position and feed it into a 2D lookup table block. That would allow you to specify ground height (z) as a function of wheel position (x,y). You can put any arbitrary table you want, giving you any kind of time varying signal you need to test the vehicle driving at different bank angles.
Hope that helps,
Mike
