Additional booklets for existing passports are no longer being issued. Instead, a new, additional passport is issued against the existing, valid passport if there are not sufficient pages left for use. You need to fill out the form meant for issue of a new passport. Please check the procedure and required attachments from New Passports.
Holders of hand-written passports or passports with 20-year validity:
Government of India has started issuing Machine Readable Passports (MRPs) since 2001 and all new Indian passports are ICAO-compliant MRP passports. Indian citizens holding handwritten passports as well as 20-year validity passports with validity beyond 24th November 2015 should apply for re-issue of passport and obtain MRP passports well before the deadline in order to avoid any inconvenience in obtaining foreign visa or problems in immigration.