Create Multi-boot using VHD

I am trying to find information of how to use a VHD backup to create a multi-boot machine. I have a machine currently running Win 10 with a large hard drive. I have an older machine that I only need for some old programs and data. I have created a VHD using the Disk2VHD utility. I want to add the VHD to the Win 10 machine as a second operating system that I can boot when I need to use it. How do I do this using the VHD image I have?

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Terry