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If you want to use Windows 10, but you’re not sure if it’s compatible with programs that you’re using on Windows 7/8, you can test Windows 10 by install it in virtual machine. But if you want to test Windows 10 for some specific purpose, for example, playing game, you will need to install Windows 10 as host operating system, not in a virtual machine. If you have available disk space or another hard disk, you can install Windows 10 as another operating system without affecting the previous operating system on your PC. On dual boot system, you will see boot menu options which you can choose an operating system every time the system boots.
In this video, I will show how to set up dual boot Windows 10 with Windows 8 on the same PC by shrink an existing partition for installing Windows 10.
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Remove a Windows OS from Dual Boot system
https://www.youtube.com/watch?v=fQhOb_hGQQw