Creating a script from afar...

Ok, so I want to test something which requires me to create a script strictly from the UI. How can I do that? Have my neurons taken leave??? In HS2, you could do this - well, at least if I remember correctly, I did.. In HS3, when I click "Edit" it only allows me to select an already available script to edit. But I want to create a new one. Have I missed something in HS3? :confused:

Robert