To answer your question specifically, certain design elements were licensed from other countries, before being largely indigenized. For example, the Vikas engin

To answer your question specifically, certain design elements were licensed from other countries, before being largely indigenized. For example, the Vikas engines were initially developed in the 70s, from Ariane's Vulcan engines. This family of engines powers the second stage of the current mission. Cryogenic engines were initially bought from Russia, but economic sanctions in the late 90s-mid 2000s forced India to develop its own indigenous cryogenic engines. These were based on the Russian models the Indian engineers were already familiar with, though it delayed the development of India's space program by at least a decade.