1.) Go To Start -> Accessories –> Command prompt ( Right Click )
2.)Select -> Run As Administrator.
3.) Follow The Commands In the command Prompt.
cd\
diskpart
list disk
select <DISK> ( e,g. select disk 1)
Clean
Create Partition Primary
active
Format fs=NTFS LABEL=”<XYZ”
4.) Copy the Operating System YOu want to boot and install in that Pendrive(USB)
It Can also Boot Different Operating system using the Same Device.