How much proportion of the share capital should the parent company hold to make a co. its subsidiary? And if the shareholding is less than 50%, then what are other requirements (like- the proportion of voting rights) to make the co. its subsidiary?
A subsidiary is a company which the parent company has "a controlling interest". Control is normally defined as greater than 50% of the voting rights and/or day-to-day control of the Board (eg through a legal right to appoint directors).