Cloning M.2(OS) to 2x Samsung NVMe 960 Pro on a PCI Twin SSD Card(OS)

So looking to clone my M.2 256mb to 2x Samsung m.2 960 Pro onto a Pci twin SSD Card for Operating System only and myabe someone can help, or have idea's or links to how this can be done, i've searched on here and can't find anything. Anyone any idea's how this can or can't be done.

Thanks Guys.