How can I change the default sheet size specification in a sheet metalworking analysis?

There is a default size that you can change by altering a System file called the "Customization file." See here for information on editing this file. Search for the variable SheetWidth. SheetLength is immediately below it. Change the numeric width and length dimensions (inches).

A feature is to be added for version 2.1 of DFM Concurrent Costing, which will allow the selection of sheet sizes from a dropdown list, specified and editable in the Material Library.