Transfer of goods from one firm to another when they share the same godown

Please clarify you have two diferent registration or only one registration

Case 1: If both firm have different GST registration numbers then this stock transfer treated as supply of goods u/s 7(1)(c) sch I entry 2 & GST applicable on it.

Case 2: If there is single GST registration for both firms then It is not treated as supply & No gst applicable.

In 1st case you only have to raise GST invoice on another firm's name & charge GST no need to generate E-way bill as there is no physical movement of goods.
In 2nd case you only need to pass stock transfer entry.

अगर माल का फिजिकल ट्रांसफर नहीं होता है तो ईवे बिल की आवश्यकता नहीं होती है क्योंकि आप के केस में माल का फिजिकल ट्रांसफर नहीं हो रहा है इस कारण ईवे बिल की जरूरत नहीं है केवल और केवल इनवॉइस बनेगा