The 64-year-old Indian tycoon’s favored plan shares elements with that of Walmart Inc.’s Walton family, people familiar with the matter say, and could provide the framework for one of the biggest transfers of wealth in recent times. Ambani is considering moving his family’s holdings into a trust-like structure that will control the Mumbai-listed flagship Reliance Industries Ltd., the people said, asking not to be identified on a topic they’re not authorized to discuss publicly.