Warcraft 3 World Editor: How do you clear the map of units including trees and starting points?

ok i made this map that i really like, but then i notice it was a bit too small, so i made it bigger in size, but i had to remove all the units on the map so i can place them farther apart from each other. but i can't seem to find out how to delete the units on the map. sometimes randomly i get to move the units and buildings which i dont know how i did it. still i cud not move the trees. so can anyone tell me how to delete ALL the units on the map?Warcraft 3 World Editor: How do you clear the map of units including trees and starting points?
Ok, I understand your problem. To delete units, hold left click with your mouse and drag it past all of your units on the map (There should be a huge green square. Then, let go of the left click. Now you have selected all your units. Now, on top of world editor, click on the Cut button (Looks like an sissor icon). The Cut button can delete all the units you select. If you want to delete a doodad, then go to doodad palette, and do the same thing. To move units and buildings, just left click on it and drag it around where you want to put it on the map. If you want to move trees go to doodad pallette, then drag it as if it was a unit. Hope this helps :D