1.All added Parts have a CAD-Line; why doesn't the Base-Part?

We do not want you to automatically add Joints to the Origin of the Base-Part.

2.Why?

For the Base-Part, we have found it to be useful to add Points and Lines that are not at the Origin or along the X-axis or Y–axis.

3.Why?

You can edit the dimensions later, and also add the dimensions to a Design-Set.

4.Why do we want to edit Points and Lines in a Base-Part?

a)If the Points or Lines are used for joints, you can easily edit the dimension to move a kinematic-chain.

b)Move the Plane and Mechanism-Editor in the Machine Frame, if you use a Line for a new Plane and Mechanism-Editor.