Create a VHD and add it to the Boot menu using bcdedit command

Let's list the steps

Create a VHD from Disk++Management
Or create a VHD from Command line using diskpart command
Attach the VHD if you already have an existing VHD using Disk Management
Or attach VHD using Command line
Copy a BCD entry and edit it according to the new value

Create a VHD from Disk Managment

We can create the VHD from the Disk Management from computer++management, see the following link http://www.sevenforums.com/tutorials/566-virtual-hard-disk-create-attach-vhd.html

Or create VHD from Command line using diskpart command

create vdisk file=\"D:pathToVhd.vhd\"
type=expandable maximum=maxsizeInMegabyte

For more information see the following link Windows 7 - VHD Boot - Setup Guideline

Attach the VHD if you already have an existing VHD using Disk++Management

You can see the first link

Or attach VHD using Command line

Iskpart select vdisk
file=c:windows7.vhd attach vdisk list volume select volume
\<volume_number_of_attached_VHD\> assign letter=v exit

Copy a BCD entry and edit it according to the new value

First we will see the existing entries by command bcdedit, this will list all existing entries, then we will select the++entry++for the same windows for example I will++select++the++entry++of windows 7 and copy it and then change it's value to the new value,++remember++that we used the GUID to do this

bcdedit /copy {originalguid} /d \"New
Windows 7 Installation\" bcdedit /set {newguid} device
vhd=\[D:\]Image.vhd bcdedit /set {newguid} osdevice vhd=\[D:\]Image.vhd
bcdedit /set {newguid} detecthal on

Fore more information about bcedit command see the following link http://www.sevenforums.com/tutorials/2676-bcdedit-how-use.html http://technet.microsoft.com/en-us/library/dd799299(v=ws.10).aspx DiskPart help