Patents of addition in India relate to improvements in or modifications to patented inventions. A patent of addition cannot be granted before the main patent is granted. If the main patent is revoked, the patentee may request the conversion of the patent of addition into an independent patent. Patents of addition have the same term as patents for the main invention.
However, you must realize that the patent of addition will expire along with your main patent. In case you file patents of addition in India after, let’s say, 2 years of the grant of the main patent. Then, your patent of addition will expire once the main patent expires, i.e. in 18 years.
Also, do make sure that you check out this free e-book: A Quick Guide to Patents. Basically, it deals with basics of patent procedures.
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