Just like most inputs in WayScript, code editors allow you to drag variables directly into your code.
Each code editor, has its own 'local' file, and shares any "global" files throughout your script with any other steps of the same type.
To work with files, click the chevron in the top-left corner of the code editor. You can add new global files for easy access throughout your script.
For a better coding experience click the arrows at the top-right of your editor to enter full-screen mode, or use the + and - buttons to adjust the font size.