Think of a company like Tata Group. The people sitting at the very top — Ratan Tata and the board — decide: Should we be in steel? In cars? In IT? That's Corporate Level Strategy — the big picture, the 'what business are we in?' question. One level below, the managers running Tata Motors separately from TCS ask: How do we beat Hyundai? How do we win more clients than Infosys? That's Business Level Strategy — the 'how do we compete?' question. And then on the ground floor, the HR head, the finance controller, the marketing team at TCS ask: How do we recruit, budget, and advertise to support that goal? That's Functional Level Strategy.
The three levels work top-down: Corporate strategy sets the direction, Business strategy translates that into competitive action, and Functional strategy executes it through day-to-day decisions. Each level has its own time horizon — Corporate is long-term (5–10 years), Business is medium-term (2–5 years), Functional is short-term (up to 1–2 years). Each also has different decision-makers — Board/Top Management → SBU Heads/Divisional Managers → Functional Managers.
For a single-business company like a standalone CA firm or a local chain like Haldiram's (if run as one entity), Corporate and Business levels practically merge — there's no 'portfolio' to manage, so strategy is mostly at the business and functional levels. The exam loves this nuance. Also remember the key term SBU — Strategic Business Unit: a semi-independent division with its own competitors, customers, and profit targets. Tata Motors (cars) and Tata Commercial Vehicles are two separate SBUs within one corporate parent. This is asked frequently as a 4-mark question asking you to distinguish the three levels with examples.