Transfer Windows 8 from one HDD to another HDD (with Windows 7 on another partition)

I want to transfer Windows 8 from one HDD to another HDD (with Windows 7 on another partition).

I bought Windows 8 Pro 64bit update (I had a a Windows Vista DVD i never even used), placed a new hard drive in my custom made desktop and installed it on a 3.5' 500GB hard drive and then removed it from my Desktop and placed back my 3.5' 2TB older hard drive that had Windows 7 Pro 64bit. Can I partition my 2TB drive and transfer Windows 8 on it, so I can use the 500GB for something else?

To be honest I only installed it and used it for two hours after I installed it and was a bit disappointed (I'm too used to Windows 7) so I placed back my old hard drive with Windows 7.

If i reinstall Windows 8 on the 2 TB hard drive, will it take the license/serial from the BIOS of the system? Was it installed there?

Can I use that Windows 8 for a new PC will build in the future? It has been 4 months since I first installed Windows 8. I never used it again.

Please note that I only have some basic IT skills, but I am a fast learner and do research if needed.