One example of sensitivity analysis is when you compare drivers for top-line planning. If you have a sales capacity model for your top-line plan, you could run a sensitivity analysis to see whether the more impactful driver of the model is increased AE hiring or quota attainment.
You’d build the baseline model and then create two duplicates — one that increases headcount and holds attainment steady and one that increases attainment assumptions while holding headcount steady. You can compare the outputs side by side to see which lever your business is more sensitive to.