First issue I'm running into is the custom part.
Let's say I'm trying to make a ring with custom stats. When creating items I can see that they have a "Stats" field, which I assume dictates what the piece of equipment does when equipped, but I can't seem to find where to create a new stat. They don't seem to be templates, unless I've been missing something obvious and I'm too sleepy to understand the resources button right now.
It would also help me to see how the editor handles generic rings and amulets, as I've found no reference to them in the resource list either.
The stats work is done mostly outside the editor in .txt / .xlsm files.
It looks like though that Larian forgot to include the .xlsm files in the Steam version of the editor.
In the GOG version they are in the folder Data\Editor\Templates
