Gimli

I managed to figure this out and thought i'd share in case anyone else has this issue. I was massively overcomplicating the process and it turned out to be quite easy to get working. Added to extra formatting steps in the task sequence so it looks like this: for UEFI booting 300 MB (Windows RE Tools) NTFS 512MB (EFI) FAT32 128MB (MSR) MSR 200GB for OD, NTFS 50% for 1st VHD, NTFS 100% for 2nd VHD, NTFS Then after the "Setup Windows and ConfigMgr" step. Connect to the file share with the VHDS ( Connect to Network Folder) Copy the VHDs to each partition using robocopy (Run Command Line) And then i used a scrpt found here: https://blogs.technet.microsoft.com/danstolts/2011/03/how-to-automatically-create-bcdedit-data-for-a-boot2vhd-file-on-your-windows-7-or-windows-server-2008-r2-machine/ to Add the entries into the boot menu and also rename. I created a package with source files, and added the script into there and then used a Run Command Line step to call the script and rename and add the boot entries Hope that helps anyone else with this issue.

Does anyone have any experience they can share on how to get a system to triple boot using VHDX files? I've been following this guide https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/boot-to-vhd--native-boot--add-a-virtual-hard-disk-to-the-boot-menu and can get only one to boot but trying to add a 2nd does not show up at all. The end goal for this is to be able to install Windows 10 on the 1st partition and then have 2 VHDX files on 2 partitions, and allow the boot menu to show all three options. I am not very experienced with VHDs and boot menu customizing so i'm struggling with this, any help would be great. Thanks.