Hopefully, this helps you.
Switch Windows 10 Pro code key to a different laptop
I purchased a new laptop to replace my existing one which I purchased and upgraded to Windows 10 Pro and I am going to de-commission. My new laptop has Windows 10 Home. I have the key code, just need to know what I need to do to re-use that code key that I already own.
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Teemo Tang 11,416 Reputation points
2020-07-20T06:54:19.367+00:00 Welcome to Microsoft Q&A Platform.
There is a complete guide for you
How to transfer a Windows 10 license to a new PC or hard drive
https://www.windowscentral.com/how-transfer-windows-10-license-new-computer-or-hard-drive
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.