Two Jumpers:
At the beginning of a game, before the announcer says, "Let's go to the floor for player introductions," hit start and go to substitutions. Change the lineup so that one of the players already in the game is at the center's position (ex. if you have the Lakers, take Kobe and switch him for Shaq). Then, exit out of the substitutions. The player you switched with the center should be at the line along with the original center
Always get the trade:
Go to the team management screen and select owners. Change CPU on the team you want to do the trade with to your owner name. Then go to trade and make the trade. The computer will always accept the trade if you own both teams.
Create Perfect Team In Season:
This Is a good code to use if you want to make a great team when you already started your season and saved. From the main menu in "Season" go to "Front Office" then go to "Ownership Change" then make every team a user then make all the trades you want. Then once you have made the dream team that you have wanted, go and do the same thing over again except this time change all the users back to "CPU" and just keep the Team(s) you want
Secret Teams:
To get secret teams you will need to do a season. After the season if you made the playoffs you will need to get to the finals. If you get to the finals you need to win the finals. Then say you won with the Lakers you will get an old Lakers team. You can only play with them in exhibition mode. Any team you beat it with you will get an old team of them. Hint you need to play an 82 game season.