New to WC3 editor. [Creating a wall].

[Maxell93]

I'm wondering how to create this wall that has been used in multiple tower defence maps.

 

[Accname]

Its a doodad type called pathing blocker. It is just a standard destructible with no visible model but with a pathing map which changes the pathing at its position.
They are preexisting in any wc3 map in different sizes and types just search for pathing blockers in your destructible palette.

 

[Maxell93]

I actually mean the purple/gray wall next to it.
EDIT: Solved, sorry thanks for the other thing anyway.

 

[annihilator127]

The areas shaded purple simply indicate areas on the map that land units cannot travel over.