I was confused by your message as well so I hope John Hackenroe
got it right...
You can play an exhibition match in Training Club -> Match.
You can edit the player to your linking in Training Club -> Character Sheet -> Player 1 & Player 2.
You can go to the World Tour -> Tour Info -> Ranking -> Click a Player -> Character Sheet -> Export to the Training Club (on the bottom right), save him, and then load him from Training Club -> Character Sheet -> Player 2.