Some embodiments provide a program. The program receives from a client device a request specifying a plurality of variables comprising set of sources and a set of objects. The program further receives a set of values from the set of sources. Each value in the set of values specifies an object in set of objects. The program also receives a selection of a set of defined scenarios for the request and the set of values. The program further generates a set of linear programming models based on the set of defined scenarios, the request, and the set of values.