if I have a document (artboard) where height is set to 12" but I need to add 1" to get 13"...when I make that change the artboard compensates by moving the dimensions out on both the top and bottom, which now alters my positioning of my artwork so it is no longer centered (I had centered based upon 13").
Can I control where I want the extra " added as in P-shop? So, if I could get the extra " added to the bottom of the document artboard, I'd be golden!
Anyway to do this in InDesign?
You should be able to control this using the Page tool to change the page dimension, I think.