Defining System Landscape in Implementation Project

Hi

I want to ask about defining System Landscape of an implementation project in solution manager.

I have assigned the logical Component in Systems tab.

I want to ask about creating the IMG Project in Sstems Landscape tab,, Is it compulsory to create IMG project for the new Implementation Project??? Why we create IMG Project?? Is it compulsory??

Please guide

Regards

Sidra Hasan