Your query is not clear. In which State you have the Corporate Office? What is the product that you are not permitted to sell in that State - and under which law? Or are you saying that you are not supposed to sell the product in a particular state due to any licence agreement with any party?
If the Head Office is only a commercial establishment and the sales takes from the depots, where-from the invoicing takes place. Although the manufacturing takes place in the factory and the goods are delivered ex-depot, I presume the invoicing should be happening from the HO (usual practice). If so, actually the sale is construed to take place from the HO and it ought to be registered both as a Shop & a Commercial Establishment.
However, if the sale takes place from the Depot (invoicing), and the HO is registered as a Commercial Establishment, HO can always display its products, either the actual or prototype as display/promotion.