I'm not sure that this was posted, at least I have found nothing per search in forum.
So the Idea is just to have 1st Floor as ground zero, using AC's international version in/for countries where ground zero is 1st floor.
For that AC(INT) users must just set 0.000 to 0.floor(also to heigth to next) AND the same for 1.floor(height to next=story height). (see attachment)
So the 0. floor will be blank-virtual floor/desktop, that can be used for 2d template objects, or as cover sheet for example.
This is especially needed by automated calculations, when you need to see near Story name(user-defined) correct Story#(AC's GLOBAL). For example if you use "Story" Criteria in "Element ID Manager...".