First I want to thanks you guys who helped me, you are great!
I used the group function and worked perfectly, so the function on EDIT SU materials...
But still I have one last issue, as you can see on the image there is a fail between my grass and my floor...any hint to help me? Thanks very much!
PS: do you guys think the grass is good looking? I lowered the scale, but its seems...different from a real grass :S
Second Try :)