A free model (FEM) provides a context-free environment for modeling any kind of objects or systems. It is generally associated with a set of extensions, which allow you to define your own concepts and graphical symbols.
To create a new, empty FEM - Select Free Model.
, and chooseFor information about extending objects from their property sheets, see Extending Objects. For detailed information about all the extension mechanisms available in PowerDesigner, see Customizing and Extending PowerDesigner > Extension Files.