No, WED comes only with Extra, Com and Pro.

But you can create your level in Blender, Cinema 4D, Maya whatever, export them to .fbx format and import them in MED. Than save them as a normal .mdl (MDL 7) file.

Or you create it in MED and save it as a .mdl (MDL 7) file.

Then load it into the scene with ent_create("level1.mdl",null,null);

I think that should work.