Code:
$sSourceINI=".\x.ini"
$sSourceSection="SOURCE"
$sDestINI=".\y.ini"
$sDestSection="DEST"
 
; First, delete the destination section
$=WriteProfileString($sDestIni,$sDestSection,"","")
; Now, copy the section over from the source
For Each $sKey In Split(ReadProfileString($sSourceINI,$sSourceSection,""),Chr(10))
	If $sKey
		$=WriteProfileString($sDestINI,$sDestSection,$sKey,
			ReadProfileString($sSourceINI,$sSourceSection,$sKey)
			)
	EndIf
Next
Exit 0