When creating an attribute as a stringlist in the GUI, the items are listed one at a time. You can then select each item and it is highlighted and you are given options.

You should be able to click and hold the items and drag them into any position or be given an option to raise or lower the highlighted item into the order you want as is done in scripts. Saves going into the game's code view and doing it there.
Thanks from lazy Forgewright.