How do I add another operating system for Dual boot in Windows 8.1 boot configuration?

Hello,
I am trying to create a dual-boot Windows 8.1 Pro system to allow both 32bit and 64 bit Windows 8.1 versions.  I currently have Windows 8.1 32bit installed.  Appreciate some background on how to add 64bit Windows 8.1.
Thanks, in advance.

The easiest way is to do this (this assumes some technical knowledge as well as access to the currently installed operating system and the 64bit install files)
1: launch diskpart from run or cmd
2: select the current OS disk using "select disk 0"
3: select the current OS volume using "select partition x" where x is the number of partition (you can use "list partition" to see all current partitions)
4: enter "shrink minimum=xxxxx" where xxxxx is the size in megabytes you want to new OS to have
5: Enter "create partition primary"
6: Enter "format quick fs=ntfs label="Windows x64""
7: Enter "assign letter y"
8: select your current system partition using "select partition x" where x is the number of partition. If you have a UEFI install on a GPT disk, this partition will be formatted in fat32. Otherwise, it will be a 100mb NTFS partition
9: Enter "assign letter s"
10: exit diskpart, and open up an administrator cmd prompt
11: Enter "dism /get-imageinfo /imagefile:e:\sources\install.wim" where e: is the drive letter that you have your .iso mounted in. If you have the iso extracted, you can just point to the current extracted area then \sources.install.wim. This will
show you a list of indexes that the .wim file supports. A standard retail version of the .iso will have Windows 8 Pro be index 1. If it is not, just change the index number in the next command.
12: Enter "dism /apply-image /imagefile:e:\sources\install.wim /index:1 /applydir:y:"
13: Enter "bcdboot y:\windows /s s: /f UEFI" (if you are using a MBR disk and not UEFI with a GPT disk, enter /f BIOS instead)
14: Reboot, select the x64 partition in the menu that comes up, and you are good to go!
You can also just create a new partition using disk manager then boot to the x64 disk and install it to the new partition, but that runs the risk of accidentally installing over something that shouldn't be if you select the wrong disk.

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