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go to edit postion and select the defenders and move them up to the red area (depending if you want to put them in forward position) then change their position e.g. LWF/RWF/SS/FC note you can only have a certain amount of players playing in one position
You could probably set their attack, so that they all run to the same i.e. right-midfield, apart from that I don't think there's a way
I've never heard of such a hack in any PES game and I don't think there's really any need for it.
You can position players to the edge of the defencive/midfield/attacking zones and use the appropriate attacking and defensive arrows to make them move in the required directions.
And a 2-1-7 formation wouldn't be that great to watch. How would you get the ball to the forwards in the first place? They'd spend most of their time rushing back to get the ball and would be caught out of position anyways.
You can play a 2-4-4 formation with 3 midfielders pushed up right to the attacking zone border and making forward runs which turns it effectively into a 2-1-7.