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The Modify command is used to change characteristics of or extend existing track by adding new track. This command works with any unconnected track endpoint, or with a Cornu or Bezier track even if connected
The Modify command can be invoked using the Change>Modify menu item, the Modify button or the menu raised by a Right-Click over the Main Canvas.
Either the left mouse button (for changing length or creating a tangent track) or the right mouse button (for extending with a new track) is used to modify the unconnected endpoint.
The endpoints of a Line, Dimension Line, Table Edge or Bench-work can be dragged to new positions. A Box or a FilledBox can be modified by selecting a corner and dragging in two dimensions, or a side and dragging it orthogonally. These modifications preserve a 4-sided rectangle.
The controlpoints of a Cornu Track, Bezier Track or Bezier Line can be changed.
Curved Lines are modified in same manner as curved track.
Selecting a corner of a Poly Line or Polygon moves that corner to a new position, and if moved close to a neighboring corner will merge the two corners and delete the edge between them. Selecting an edge will create a corner that can be dragged to a new position.
Any tracks created during the Modify command will have the following properties inherited from the first track: selected state, hidden state, scale, track gauge and Layer.
For detail about;