Here are the steps to maxing all motives! (Exept room)

1. Save the game.
2. Open up the cheat window by pressing the button combination Ctrl + Shift + C.
3. Type in: move_objects on
4. Go onto build mode and select the sim you want to make happy using the hand tool.
5. Delete the sim.
6. Go onto live mode and click the + symbol in a circle and your sim will appear with full motives!

Hope this helps!