Define a forecast model

Define the entities that must be used to generate the forecast.

1. In the General step of the Forecast configuration page, define the fields that should be used for the forecast.

[Steps 2 to 6 omitted]

7. Select a Rollup to hierarchy relationship.

This step establishes a relationship between the rollup and hierarchy entities. Each forecast template starts with a default rollup to hierarchy relationship:

Choose different values to support your organization's specific requirements if needed.

Note: Select a template

The fastest way to create a forecast is to use a template. The template that you select defines how the forecast groups data.

On the Forecast configurations page, select one of the following templates:

Org chart forecast: Rollup columns and projections are based on your organization's reporting structure. This template uses the Manager field of the User entity for the hierarchy.

Product forecast: Rollup columns and projections are based on the product hierarchy.

*-> Territory forecast: Rollup columns and projections are based on the sales territory hierarchy.

https://learn.microsoft.com/en-us/dynamics365/sales/define-general-properties-scheduling-forecast