How does Collaborative Forecasting work in Salesforce?

Collaborative Forecasting allows sales managers to review and adjust their team's forecast in a hierarchical view. Key components:

1. Forecast Types: Each type measures a different field — Opportunity Revenue, Opportunity Quantity, Product Family Revenue, Opportunity Splits, or Territory (when Territory Management is enabled). Multiple forecast types can be active simultaneously.
2. Forecast Periods: Monthly or quarterly, based on the fiscal year settings.
3. Forecast Categories: Pipeline, Best Case, Commit, Most Likely, Omitted, and Closed — mapped from opportunity stages.
4. Adjustments: Managers can adjust their own or their subordinates' forecast amounts without changing the underlying opportunities; both the original and adjusted values are preserved.
5. Quotas: Uploaded via Data Loader or the UI; compared against the forecast to show attainment. Forecast sharing allows delegates to manage a user's forecast.