Searching for More Itineraries
Additional itinerary solutions are only available through the Find More Itineraries feature.
On the Details tab of the Itinerary Planning
screen, click the Find More Itineraries button: 
The server performs the single search step that is the first in the list of the
steps that have not been performed up to that point. The step may be either conditional or
suppressed.
When the Find More Itineraries command appears shaded, there no more itinerary solutions to be found.