Hi Darshana,
You are missing the Model Reflection:
https://appstore.home.mendix.com/link/app/69/
https://docs.mendix.com/appstore/modules/model-reflection
Please check the complete Excel Import Documentation. It is actually very clear and you have your steps there :).
https://docs.mendix.com/appstore/modules/excel-importer
Steps:
https://docs.mendix.com/howto/integration/importing-excel-documents