Hi @RyanSWS!
It is available and you can choose it BUT I have found that when I try to first create an subitem automation, not all the columns of my subitems appear (it almost seems as though I don’t have anything on the subitems).
However once you make a custom automation like: “When subitem x changes notify x” you can then edit the automation and now when you click the subitem x, all of the columns will be available to change.
At least, thats how I have gone around it that way so far.
Hope this helps!