If the godown is not the principal place already registered, it is ordinarily an additional place of business. That is true of a rented godown on the Deoria road, a second floor in the city, or a shed at GIDA that is not the address on the registration. The amendment is a GST portal filing, with a document of possession (rent, allotment, NOC) that matches the name on the registration.
Job-work at someone else’s shed is a different fact — a delivery challan, not an additional place of the principal. Do not treat them as the same. See GST registration in Uttar Pradesh and setting up a factory in GIDA.
Questions this page usually meets
Can I start storing goods and add the godown later?
That is how e-way bills get blocked and how a later inspection writes a finding. Add the additional place, then move the goods.