Visio Line Question

How do you create a long curvy seamless line in Visio.

WHenever I draw a line it seems to have only the ability to connect objects and that is all.

What f I want to draw a loop that starts from one object and then swoops over the top of another object to make a 300 degree arc?

I have tried this with lines drawn end-to-end. How do I merge the lines together into one seamless line?