Use the Part-Editor to add and edit sketch-elements in any Part that is in the model.
For example, you may need to:
•Specify in a Part the position of Pin-Joints and Slide-Joints with Points and Lines.
•Specify in a Part the shape of Extrusions with Arcs, Lines, Circles, ...
•Specify in a Part the path of a belt, path of a motion, the center of a gear, ... with Lines, Blend-Curves, Arcs, ...
Because the Base-Part does not have any sketch-elements when you add a Mechanism-Editor,
•You must edit the Base-Part to add at least one Line.
Note: To edit a different Part...
... you must first exit the Part-Editor to return to the Mechanism-Editor. Then, from the Mechanism-Editor, edit the different Part.
Part-Editor Menus and Toolbars:
•Geometry menu and toolbar to add sketch-elements
•Constraints menu and toolbar to add and edit constraints