RailwayRouteOptimization/scripts/Projection/IsometricProjection/IsoProject/doc/IsoProject_proc_en.html

<ol>
  <li>Select the entities you want to project.</li>
  <li>Launch this tool.</li>
  <li>Choose a projection type and a viewing direction for the projection in
  the options tool bar.</li>
  <li>Set the reference point for the projection. This is the point you will
  use to position the projection in the next step.</li>
  <li>Move the mouse cursor to the position where you want to create the
  projection and click to set the position.</li>
</ol>