title: CMAKE - getting a path using get_filename_component
body: <p>I have a path and i would like to get the path starting from a specific path
  This is my current path     </p>
  
  <pre><code>   macro(MY_MACRO base)
  
      foreach(ITEM ${ARGN})
         get_filename_component(ITEM_PATH ${ITEM} DIRECTORY)
         get_filename_component(ITEM_EXT ${ITEM} EXT)
         source_group("${ITEM_PATH}" FILES ${ITEM})
         MESSAGE ("${ITEM_PATH}")
      endforeach()
  
      endmacro()
  </code></pre>
  
  <p>The above outputs this</p>
  
  <pre><code>/Users/admin/main/project/module/pilot/pilot/src/proA
  /Users/admin/main/project/module/pilot/guide/src/proB
  </code></pre>
  
  <p>I would like it to just display the path starting from the last level
  it should only show the path after the folder pilot
  so it should show something like this</p>
  
  <pre><code>pilot/src/proA
  guide/src/proB
  </code></pre>
  
  <p>Not the full path</p>