Use 1-2s to trigger runs
1-2 combinations are very important in football. You pass to a nearby player and make a run to eventually get the ball back.
In PES, you can use this technique to trigger a player run. You can simply pass to your teammates (by pressing L1 + X) and end up not returning the ball to that player - the player will still be making a forward run, which can come in handy later (eg: triangulation).
Sometimes players aren't going for runs and are pretty static, so this is always a nice way to keep players moving throughout your offensive play.
More tips related to: Attacking