What Gucci said. Essentially you're telling PBS that you MUST have those days of and only be awarded those trips...if not you want it to go to the next bid group.

Clear schedule and start next also stops PBS from going into denial mode. If you got rid of the CSSN, and you go into denial mode, your else start next will be honored. However, it may kick out your other award lines in an attempt to award you a line.

If you wish to allow PBS to go into denial mode to allow it to build you a line AND you want to avoid any crap trips that may be awarded during the "award pairings" bid line. Then I would add avoids to the top of your bid group so it kicks out any trips you don't like. This way, when PBS gets to the award line those trips are no longer in the pool of trips available.