Can I change my passport after I have booked an American visa?
Yes. You can and have to if it is no more valid or validity is to short. Get the new passport , fill up your DS 160 again with new details. At the time of biometric inform VFS officer about it they will do the needful. It means they will change your passport details on your profile and they will update DS160 reference number in your profile too. Please carry photo copy of old and new passport along with original.