This article will explain how to Create a Windows 8 universal UEFI enabled DVD/ISO
Copy all files from the Windows 8 DVD to a local folder eg. C:\Win8Media
Now let’s make it universal (you can select which version your want Windows 8/Windows 8 Pro from the same DVD)
Create a file called ei.cfg save it in C:\Win8Media\sources\ei.cfg
[Channel] OEM
Now let’s make the files back to a ISO And enable UEFI Boot:
oscdimg.exe -m -o -u2 -udfver102 -bootdata:2#p0,e,bC:\Win8Media\boot\etfsboot.com#pEF,e,bC:\Win8Media\efi\microsoft\boot\efisys.bin C:\Win8Media C:\path\to\new\win8pro-uefi.iso
You can get the oscimg tool (Windows Assessment and Deployment Kit (ADK)) here: http://www.microsoft.com/en-us/download/details.aspx?id=30652 or download just the tool from http://blog.paulbetts.org/index.php/2011/09/17/converting-a-win8-install-directory-to-an-iso/