Player from Dynasty to practice court?

Needing help. I see a lot of screenshots of ballplayers that people are previewing at the practice court setting. If your player that you want to preview is already in your Dynasty, how can this be done? I'm assuming it's just a matter of placing the players.dbf file in your saved slot to the correct folder in the NBA LIVE folder but I don't know which one because players.dbf seems to be everywhere. Anybody have any hints?

On a side note: I really appreciate all that have helped me along the way,(ie Bolbronx, Andrew, etc) You guys help my ignorance not necessarilly equate to my stupidity.

just overwrite your dynasty roster over a save roster with dbf editor ...