Add Portfolio Model

Key Add Portfolio Model of function Price in Tradablerefers to a wizard-only boolean flag that applies only when the tradable being priced is of type Portfolio and functions as follows:
When TRUE, the default collection of objects generated by the wizard for the key Models will include an object of type Model[Portfolio] that contains the specifications for the type of extra data that must be generated and included in the itemized part of the output.
Also the key Output will be set to Full, which is necessary for generating and reporting the itemized data.