What is Territory Management 2.0 and what is the territory model lifecycle?

Enterprise Territory Management (Territory Management 2.0) lets organisations assign accounts and opportunities to territory-based sales structures. A Territory Model has three lifecycle states:

1. Planning: The model is being built — territory types, territories, and assignment rules can be configured but the model is not active. Users can preview assignments.
2. Active: The model is live; Salesforce applies territory assignment rules to accounts and opportunities. Only one model can be active at a time.
3. Archived: The model is deactivated and becomes read-only. Key concepts: User Assignments associate sales users with territories so they gain access to accounts in those territories. Filter-based Opportunity Territory Assignment runs a rule or custom Apex logic to automatically assign the territory to new opportunities based on the account's territory. Territory hierarchies roll up revenue for territory-based reporting and forecasting.