NBA Live can be a tricky game if you follow their formula which is why I don't. You get better game results when you input 2k's ratings into NBA Live.
I used Real2kinsider as my source because he has the best 2k roster. You have to do this a certain way or the game will not play right. The Overalls will be wacky but Idc because the gameplay is amazing.
Let's use LeBron as an example.
Field Goals: 87 (I added close shot and mid range and divided them by 2) Explanation: Field Goals effects both of those things.
3pt: 87 (This one is simple. Just put the 3pt rating from the roster you're using)
FT: 77 (Just use the FT rating from 2k)
Dunk: 85 (Only use Drive Dunk 85 and not stand dunk because NBA Live does not have a rating to calculate stand dunk)
Inside Scoring: 83 (Most people would use close shot or layups alone but that does not work.) (Close shot is a jump shot rating so that is to be used with Field Goals, and Layup alone is not the only aspect of inside scoring) (You add these 4 ratings together and divide them by 4: Layups 99, Post Hook 50, Post Fade 95, Post Control 90)
Off Rebs: 44 (Just copy from 2k roster you're using)
Jump: 85 (Just copy from 2k roster you're using)
Strength: 85 (Just Copy from 2k roster you're using)
Quickness: 80 (Just copy Lateral Quickness)
Speed: 85 (Just copy Speed from 2K roster you're using)
Pass:90 (Just add all 3 pass ratings and divide them by 3)
Dribble: 87 (Just add Ball Control and Ball Speed together and divide them by 2 or you can calculate the midpoint.)
OAware: 99 (Just copy Offense Consistency)
Def Rebs: 77 (Just copy from 2k roster you're using)
Steal: 68 (Just Copy from 2k roster you're using)
Block (Just copy from 2k roster you're using)
DAware: 80 (Copy from Def Consistency)
Stamina or Fatigue: 99 (07 or 08 you would deduct 30 points away because of the substitution bug so that would make him 69 in those games.) (Just copy stamina from 2k)
Hardiness: 90 (Same as durability so just copy that rating from 2k)
Clutch: 99 (Same as Intangibles rating) (People have tested this rating and they say it's a clutch rating) (Only in 07/08)
Primacy: 99 (You will have to use openoffice or db commander to get to this in 06-08) (Just copy from the touches tendency)
ThreeATT: 69 (Edited to 2k's shot 3pt tendency) ( You can only edit this open office or db commander)