Hello Jagan,
Subcarrier modulation can be used in any coherent modulation system using the OFDM Modulation and OFDM Demodulation components. If these components are not used in the project, there is no subcarrier part. Please refer to the examples located at the following link on OFDM Modulation for different coherent systems. please contact me at ahmad.atieh@optiwave.com if you need to discuss further.
C:\Users\USER NAME\Documents\OptiSystem 17.0 Samples\Advanced modulation systems\OFDM systems
Regards,
Ahmad