It took me a few tries, reading SEVERAL threads about it, and looking at an existing map to figure it out AFTER having read the manual. I'd suggest searching through the archives here for information, unless there's a tutorial (check the Tutorials link), but I don't recall seeing one... It's one of those things that's easier to do than to explain... Essentially, you use the texture template for both transparancies and textures. The texture map you use normally, but the transparancy map you only use black, white, and - if you're adventurous - shades of gray. The darker the black, the "more transparent" it will be on the final render. Transmaps don't show up before renders, though transparent ITEMS show up as outlines only in most pre-render views. You also need to load the transmap into the transparancy channel on the Materials editor, and play with the sliders (for "standard" transparancy - i.e., a segment of the model is "gone" - your best bet is to make the transmap all absolute white and absolute black, set the minimum slider to 0%, maximum transparancy slider to 100%, and falloff to 0).