I have been working with EPM formatting sheet a lot recently, trying to build any workarounds to make it more flexible. For example, if we want to change order of different formatting rows, we have to delete those rows and all rows which were added after them, which sometimes becomes a total nuisance.
So, my question is: what exactly happens when I press "Add Member/Property" button? Some of my experiments show that this information is stored not only on the visible part of a formatting sheet, but also somewhere else.
BTW, I use EPM SP20 at the moment.