Adds nodes to lines and line segments, including objects created using double lines and multi lines. You can also add nodes to Bezier curves, splines, and sketches.

Use the Edit Tool on the object to which you want to add a node.
Press Ctrl while placing the cursor where you want to add the node. The cursor has a + symbol.
Click to add the node.

(You could also place the cursor where you want to add the node, then select Add Node from the local menu.)
You can now drag the new node to create a new line segment.

The same method can be used to add nodes to curves.

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