Astah User's Guide
Choose Line objects on the tool bar and click the start target and then and end target. To cancel creating a line, hit [Esc] key or do the right-click.
There are 4 line styles.
Currently "Curve" line is a deafult line style for DFD, "Line (Right-angle)" is for ERD and "Line" is for all the other diagrams.
To change the default line style, choose one on the tool bar.
You can change the object to connect to by dragging the end point of the line and let it connect to another object.
You can change line style from line's pop-up menu [Line Style].
By default, all the lines would be connected to the center of mode lelements.
If you want to move the connecting spots, unlock the "connecting spot" on the tool bar.
Now you can connect the line on the object any where you'd like.
There are two ways to show multiple Generalization lines into a shared line style.