I'm trying specifically to clone a Windows 10 OS from my 2TB HDD onto a 70GB partition from a 240GB SSD but as I said no software I have tried so far seems to do it.
Is used space in Windows 10 OS partition smaller than 70GB?
If it is not, then you can't clone.
Reduce used space first by deleting user files and uninstalling software.
After that you can use Minitool partition wizard free to copy partition from one drive to another.