supply from one branch to another

I have a manufacturing bussines in u.p. I produce school dress fabrics and I have a shop in kolkata from where i want to sell my product.
now my question in that how can i send my goods to kolkata from UP. should I have a new gst at kolkata?
I only have gst in u.p can I sell my product from kolkata at the same gst?
what are the rules of supply from main branch to another branch?
please reply