To create more options for editing the shape of a vector object, add, delete, or merge nodes anywhere along the path of a vector object.
You can add nodes in all three modes of the Pen tool.
To add nodes on a contour (Drawing and Edit Modes):
From the Tools toolbar, select
the Pen tool 
.
From the Tool Options palette,
select Edit Mode 
.
Click the contour you want modify.
Press and hold Ctrl as you move the cursor over the contour to where you want to add a node. The cursor displays “+ADD.”
While continuing to press Ctrl, click the line. A symmetric node is added.
To add nodes on a contour (Knife Mode):
From the Tools toolbar, select
the Pen tool 
.
From the Tool Options palette,
select Knife Mode 
.
Click the contour you want modify.
Press and hold Ctrl. The cursor changes from “CUT” to “ADD.”
Click and drag the cursor across the contour where you want to add nodes.
To add a new start or end node:
From the Tools toolbar, select
the Pen tool 
.
From the Tool Options palette,
select the Drawing Mode 
and
the Segment Type you want to use.
Select the start or end node of the contour.
Click to draw another node, the contour automatically connects to the new node.
Do one of the following:
Continue drawing new nodes.
To edit the nodes
or contour, click the Edit Mode 
.
To finish the changes, choose another tool.
Reversing the Direction of Contours or Paths