Pipeline stages are configuration, not code

Lead and deal stages are data you own, edited in Settings → CRM Stages. Each stage carries a name (in both languages), a default probability, and three flags: closed-won, closed-lost, and whether backward moves or skipping are allowed.

The shipped defaults are:

Probability drives the forecast, so editing a stage’s probability re-weights every open record sitting in it. Change stage probabilities deliberately, and ideally between forecast cycles rather than in the middle of one.