I am updating one of the products in our library.  It is a display case / trophy case and uses kv shelf standards and brackets.  The depth of the cabinet is dictated by a prompt, and the shelf depth is dictated by a prompt as well.  Unfortunately, everytime I change the shelf depth, I have to manually adjust the shelf brackets in the hardware tab.  What can I do to have the hardware update based on the shelf depth?  

I think I can get the shelf depth to change based on the case depth, but need some help on the hardware sizing.