Eric,
Please look at this drawing. With DrawingBoard, I could drag a selection box around line CD, which would also select endpoints of E and F. Then, I could move CD to the right. The right ends of E and F would stay where they are, but the left ends would shift with the vertical line.
With RC or iPD, this doesn't seem to be possible. I can move CD, but I have to trim the ends of E and F.
With RealCADD, you can do this with the command "Move points".
Simply, select the Arrow tool and, with the Option or Alt key down, drag a rectangle around the points that you want move.
A dialog is displayed to enter the delta x and delta y of the displacement.
And this feature works also with the tool "Lasso".
