Dear Muhammad,
OptiSystem allows optical signal transmission over single mode and multimode fibers. The modes that can be guided in multimode fiber depends on the geometry of the fiber, wavelength and refractive index. All of theses parameters can be set in the MMF. Also, you may view the propagated LP modes using the “Spatial Visualizer” component. There are few examples in OptiSystem Example Library that would guide you in this area.
Regards,
Ahmad