Castle Terraning? On Walls?

How do i terran a castle?
I got awsome castle wall models but how do i make it so units can run on them?
Do i have to change it to like a cliff terran or something?
if so how do i do it?

You mean the castle models from minas tirith a few threads under your? ;)
Anyway,
there are several ways you can make units walk on models, but I prefer the following method:

1st) Make your imported models to destructibles.
(Open Object-Editor, create a new destructible, or duplicate one, and change it's model path to the wanted model.)

2nd) Set the field "Course-Walkable" to "True" if it's not already.
(Also in object-editor. There you can change many other stats too, like "Grafic-Selectable in game" to "False".)

3rd) Change the height of your models to any value using "Ctrl" + "Picture up"!
(In WE by selecting the model and pressing the keys.)

That was it! Have fun!
(And if the models aren't the ones from minas tirith, I would be glad if you can post them or send them to me... )

or use soe cityscape doodads.