When pressing 'Build optimized itineraries', RouteMagnet builds the fastest itineraries for number of drivers present in Drivers tile. Orders are automatically assigned to itineary in such way itineraries have nearly the same durations to minimize the overall duration.
However it is possible to force an order to be assigned to specific driver:
- Builder -> OrdersT ile
- on target order -> Press Edit
- in Edit Order form,  'Assign a driver' select box
By default 'Any' means Optimizer will choose the best driver when finding fastest itineraries.
Change this value to assign specific driver. Optimizer will then keep this assignment when finding fastest itineraries.