It is important to obtain GSTIN (GST identification number) by registering with GST portal for any business person or firm to claim input tax credit of GST paid by him or her.
No, you cannot.
To learn about the GST registration process in detail, click here.
Yes, if you have multiple business verticals in a state, you may acquire a separate registration for each business vertical, subject to conditions as prescribed in sub-section (2) of Section 19.
Yes, the registration certificate once granted is permanent, unless surrendered, cancelled, suspended or revoked.