Let’s say you have two parts on your diagram linked together like this:
But, you want to change the diagram so that there is a further part in between “From” and “To”. Maybe something that describes what the link means between these two things.
You can do this by dropping a new part onto the link.
To do this, select a new part from the add… menu, like so:
In this example, we are going to add the new black “Connection Body” element.
Drag this over the link, so that the link is highlighted “through” the element you are dragging:
Then, let go and the diagram will re-arrange to contain this new element: