The Forecast formula field will apply the Sales Forecast
Factor to the SalesOrderHeader.Subtotal field.
1.
Right click the Formula Fields node in the Field Explorer and select
New… from the pop-up menu.
2.
Enter Forecast for the name and click the User Editor button.
3.
Enter the following formula in the Formula Editor.
{SalesOrderHeader.SubTotal} * (1 + {?Sales Forecast Factor} / 100)
4.
Click the Save and close button.
You should see the Forecast formula under the Formula Fields
node in the Field Explorer.