How can create subdirectory

Hi all,
I have a section where copy all files of my subdirectory to subdirectory of my installation directory.
But I don't know how can create subdirectory

this is my section:

Section "Install MyProgram" SEC01

SectionIn 1 RO

  SetOutPath "$INSTDIR"

  SetOverwrite ifnewer

  CreateDirectory "$SMPROGRAMS\MyProgram"

  CreateDirectory "$SMPROGRAMS\MyProgram\Plugins"

  File "${NSISDIR}\MyProgram\myprog.exe"

  File "${NSISDIR}\MyProgram\Plugins\myp.dll"

  File "${NSISDIR}\MyProgram\Plugins\ask.dll"

  File "${NSISDIR}\MyProgram\Plugins\port.dll"

SectionEnd

I mus create Plugins subdirectory on myProgram directory and copy ofcourse the dll files on Plugins subdirectory.

Thanks in advance.

Peter

SetOutPath "$INSTDIR"
File somefile.ext
SetOutPath "$INSTDIR\Plugin"
File someplugin.ext

no need for CreateDirectiry at this stage.