Newb question abt workers

Im a newb on Map editing, i read all of the old post, but I still got this stupid question

I wanna make a TD map,
but i found that my workers just can build normal structures.
And i try to change it in the "Ablility Properties" of the WorldEditor,
but i just see that can change spells or skills in it.
Its there any methods to get another kind of structures!?
Need another programme to do it?

I already get the things in war3.mpq
but im not sure how to use it, or import it into the WorldEditor...

If this question already post in old post, pls paste the post link here.

Thx for the help :)

There's a "Builds" field in the Unit Editor... just go to your custom worker, scroll down to "Builds", click, and select what buildings you want him to build

Another thing, if you want them to be able to start the building and move on, use the acolyte and make it whatever you want. And since now you can change the unit sounds, they dont all have to sound like that guy down the street that seems to want your dead grandma. And you cant have more than 11 buildings, since the cancel button takes up one slot too. And if you need to, make a series of builders.

OIC :)
Thx for your help....
I know where to edit it now :)