You can purchase add-ons online till you make final payment. Once payment is made, no changes are allowed. However, please contact dealership to buy add-ons directly at dealership.
For add-ons which are exclusively available only online, for e.g. data pack subscription for Chetak, you may buy it online at any time after vehicle delivery. You shall login to website and navigate to “My Vehicles” to purchase / review data pack subscription online.