I had 2 folders with pictures for this tutorial and i delete the good one.
I try to recreate my first tutorial so here you go
When i unwrap uwv i like to do my texture first.
I go in photoshop and place the new hair on my texture
1- Open your model yobj in 3dmax
2- Now open the hair yobj you want to add to the model.
3- While the hair is selected press unwrap uwv then edit , a little window will pop up
Now it should look like this
4- Go to pick a texture and chose your textures