Check out the help for this cmdlet.
Get-Help Start-NaClone -Examples
PS C:\Windows\system32> Get-Help Start-NaClone -Examples
NAME
Start-NaClone
SYNOPSIS
Starts a file/LUN or sub-file/sub-LUN clone operation.
-------------- Example 1 --------------
C:\PS>Start-NaClone /vol/vol2/lun1 /vol/vol2/lun1clone
Create a clone 'lun1clone' of LUN 'lun1'.
SourceFile : /vol/vol2/lun1
DestinationFile : /vol/vol2/lun1clone
CloneState : running
TotalBytes : 21476192256
PercentDone : 0
BytesCopied : 0
CloneType : lun
CloneId : 12
Error :
Reason :
-------------- Example 2 --------------
C:\PS>Get-NaLun /vol/vol2/lun1 | Start-NaClone
Clone LUN 'lun1' and accept the default destination name 'lun1Clone'.