You can join two objects with a curved, straight, or right-angle connecting line. If you move one or more connected objects, they remain joined by the line. This is especially useful if you’re creating a flowchart.
Before you do this task, add two or more objects to the sheet that you want to connect.
Click 
in the toolbar.
From the Basic category, click the curved line to add it to the sheet (you can change it to a straight or right-angle line later).
Drag one endpoint of the line until it snaps to an object, then drag the other endpoint until the line snaps to another object.
To change the curved line to a straight or right-angle line, select the line, click the Arrange tab in the sidebar, then click Straight or Corner.
If you don’t see a sidebar, or the sidebar doesn’t have an Arrange tab, click 
in the toolbar.
To change the amount of space between the endpoints of the line and the objects, select the line, then adjust the Offset Start and End values in the Connection section of the sidebar.
To change the position of the angles or the curve, drag the green dot (you may need to make the line longer to see it).
You can change the look of the connection line, just as you would any other line, by changing its thickness, color, line style, and endpoints, and by adding effects like a shadow and reflection.
Tip: You can add a Connect button to the toolbar for quickly adding a connecting line to selected objects.