Defining extrusion distance with an equation

I am trying to develop a master injection mold base file. I'mworking on definining my plate sizes with a layout sketch anddesign table so that I can adjust one file for any catalog size ofbase I may use. I would like to have some design table control, orat least equation control over the extrusion distances I use todefine plate thicknesses. Currently, I only seem to be able to editthe extrude features individually in each file. Anysuggestions?SolidworksParts And Features