Same procedure should be taken for the Registration of other business against same PAN No. . But its require other Mobile No. & E-Mail ID (Different from first Registration) to register the other Business.
Yes, each business will require a different licence.
Even if the same business has different offices and stores they will need different registrations.
Like in case of ecommerce every seller who take flipkart / amazon facility to store the products in their warehouses will also need to register that location sepeartely and will need to file return of that seperately.