The following TechNET artical tells you how to create the disk configuration for an EUFI based computer via an unattend file.
Create an Answer File for UEFI-based Computers
This artical tells you how to create an unattend file that will put you into “Audit Mode” after installing Windows. You can substitute the disk configuration for the EUFI if that is what you need. You’ll also need to change the InstallTo location.
Walkthrough: Build a Simple Answer File