The Assign Forecast Models app allows you to specify which forecast model is to be used for calculating the mid- or long-term forecast for the planning objects (combinations of master data characteristics) that exist at a selected planning level within a selected planning area.
The assignment of forecast models is an optional step that you can take before starting a simulation or running statistical forecasting in the background by defining a job in the SAP IBP, add-in for Microsoft Excel. If you have forecast models assigned to the available planning objects, you can select the option Consider Forecast Model Assignments in the add-in, thus making sure that the forecast calculated for each planning object is based on the forecast model assigned to that specific planning object. If you have no forecast models assigned, you can only select one forecast model for the entire planning view.
You can assign the same forecast model to as many planning objects as you wish, and the assignment process is facilitated by direct navigation to the respective models in the Manage Forecast Models app.

Prerequisites for forecasting with assigned models:
The intended level on which one desires to assign forecast models is modeled as a planning level of the planning area. This level must be time-dependent.
The planning object must exist on the intended planning level where the forecast model assignments are maintained.
The forecast models need to be created before they can be assigned.

It is possible to use the model assignments performed in the Assign Forecast Model app in the Web UI in the execution of the statistical forecast models in Excel as shown in the following figure.

If the same planning level is used, you get the option to choose Consider Forecast Model Assignments.
The following two figures show how to do simulations with the assigned forecast models.

