Creo Direct > Designing in the Creo Direct Environment > Working in Part Mode > Working with 2D Geometry > Creating 2D Geometry > Splines and Points > To Create a Spline
  
To Create a Spline
1. Click Home > Spline.
2. Select the start point for the spline.
3. To lock one of the dimensions of the entity you are creating, press Enter. Press Tab to switch to the other dimensions.
4. Select additional points to create the spline.
5. Drag the points on the spline to alter its shape.
6. Middle-click or press ESC to exit the tool.