Dual booting Windows 7 and Windows 10 with two licenses

[Windows Central Question]

I want to have a dual booting Windows 7 and Windows 10 system. I do own two licenses so I believe I can do this legally.
The ideal would be for me to upgrade my Windows 7 Pro to Windows 10 Pro on my current D drive, after cloning an image of my D drive with Windows 7 on it, and then laying in that image into another partition on the same hard drive.
And then when Windows asked for activation of one or another of the installations I would type a different key for it, in order to activate and authenticate it.
But I suspect that the boot manager somehow would not be able to handle this situation and offer me either operating system at boot up time

 

[charlatan1978]

Is this any use?
How to Dual Boot Windows 10 Preview with Windows 7 or 8

 

[rollob]

THanks Charlatan but that method gives me a Clean Install of Win10 whereas I want the Win10 to be the upgrade so it includes all the program installations I keep on a different partition altogether.
Rollo