Creating USB drive for Windows UEFI install

diskpart
list disk
select disk <usbno>
clean
create partition primary
select partition 1
format fs=fat32 quick label="WinN"
active
assign letter=g
exit
robocopy f:\ g:\ /E /XF install.wim 
dism /Split-Image /ImageFile:f:\sources\install.wim /SWMFile:g:\sources\install.swm /FileSize:2000

See https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/split-a-windows-image–wim–file-to-span-across-multiple-dvds