Hello! This guide will show you how to edit any workshop levels, either if you lost all your levels but they're uploaded on the workshop, or if you just wanna take a look on how some of your favorite levels are made.

First off, go to this directory: C:\Program Files (x86)\Steam\steamapps\workshop\content\416680
(C: or whichever disk your steam folder is in. 416680 is the ID for Zombie Night Terror)
Inside this folder you will find a bunch of other folders with more random numbers, these numbers are the ID's of the workshop levels you've downloaded.
Now, if you have only a small amount of folders you can open each one and find your desired chapter like that, but if you have a big amount of folders, go to the search tab of file explorer, search for the name of the chapter, once results appear right-click on the chapter file (.chp or .chpm) and select open file location (or something similar), it will take you to the folder which the chapter is in.
Once you've found the chapter folder, enter the next folder "Levels", select and copy all the levels you want.

Go to this other directory:
C:\Program Files (x86)\Steam\steamapps\common\Zombie Night Terror\znt_Data\StreamingAssets\Levels
(C: or whichever disk your steam folder is in)
Now here just paste all the levels you've copied in the previous step

After this, open the game, click the editor door, click on load level, then the tab "Import Official Level", scroll and you'll find the beautiful levels ready for import. Select the level, name it however you want and click on "Import Level"

And there it is! Any level from the workshop right into the palm of your creative hands!
If you need any help, comment and i'll be sure to answer.
Anyways, bye!