How do you get rid of flight assignments.

I need to get rid of flight assignments so I can cancel flights.   Its not anywhere.   I cant cancel flights . I get flight assignments exist.    I go to fleet management. Route management.  Flight numbers. Flight assignments.  Flight numbers wont delete.    Cancel flights.    Close the route. And NO!!! 

If you go to Route Management, go down further on the screen. You should see the "Scheduled Fights". Click on the box and then "Cancel Selected Flights" at the bottom. Make sure you do this for both directions. Once all the flights are canceled and there isn't any scheduled flights, then you can close the route. If you want to close the route (or delete the flight numbers), you'll need to go to the "Flight numbers" tab and delete the number after clicking on the box of the flight numbers you want to delete. (I think this is what you mean -  hope this helps)