transperent units

is there a way to make a unit transperent (ghost like)? if so, then how?

I belive its under the change unit tinting, R G B and transparency... I remember seeing it somewhere (not in the unit editor, but with triggers)

Or if you want it to be permanent invisible just give the unit the Tree of Life Upgrade Model

It is possible in fact.
Here is the answer to your question (in transparent characters of course)
.
.
.
.
.
.
.
Got it ?
Okay here is the real answer:
"Animation-Change unit vertex coloring to (100%,100%,100%) with x transparency)
Replace x with the desired value (100= totally transparent and 0 not transparent).
That's all.