thx for the answer !
but i ve Maya 3.5 and i try what you say and i failed because some "commands"not aren t corresponding.:o :o :o
i see the tuto on thehobbitguy.com and anyone who have Maya con explain me with detail that :"The next thing you're going to want to do is create 2 planes. One facing the front view and one facing the side view. Create a material for each of your drawings and assign them to the appropriate plane. Turn the transparency of the materials down to about .5, then assign the 2 planes to a layer."
how i can do all this thing ? (tell me with detail example : file>new scene.....)

thX
:p