ISn't Propulsion (Ramjet engine) "Know how, Know why" was part of TOT?Depends on the ownership of the subsystem. Airframe will most likely be Indian. Guidance, seeker etc will be Indian. The booster as well.
Propulsion and flight controls could be Russian or a mix of Indian and Russian. The source codes could very well be written in India.
We have to wait for all the answers.