1. A method for managing advertisement opportunities in a network environment, the method comprising: retrieving advertisement parameters supplied by an advertiser; dividing a program stream into a plurality of program sub-streams; dividing avails that are positioned within the program stream into a plurality of sub-avails that each correspond to one or more program sub-streams; retrieving subscriber characteristics related to viewers of the at least one program sub-stream; and correlating the advertisement parameters with the subscriber characteristics to determine which sub-avail is the optimum sub-avail to schedule a particular advertisement to display.