I create oportunities for all my "possible closings". When I do a commercial proposal, I create an oportunity. The problem I'm having is that when our service is Sold or NOT sold, every oportunity stays where it is. I mean, if the we cannot make the sell, the oportunity stays there (like not sold). 

How can i administrate my oportunities so when the closing is done or not done, I can "erase" them from the Oportunities Section?

Thanks!

Juan