creep vision question

Is there a way to make a creep unit that deosn't share it's vision with other creep units in the area?

"Creep" ? Do you mean neutral hostile or passive unit ?
Does your unit has a vision range ?
If yes and yes, i think that it' impossible.

if you mean, that creeps should stop to help each other ...
check "gameplay constants" -> "call for help range, creeps" ...and set it to an ammount you want.