# Extend
Pick up two lines and calculate the extension line from the first line to the second line.
# Drawing Steps
- Click
to launch the extend command.
- Click a line in the viewport that needs to be extended, pre-pick the object you want to extend to, and the preview effect is as follows. Light blue is the extended preview line.
- Click to select the object you want to extend to to generate an extension line. At the same time, a "point on line" constraint is added.
- End the command by the ESC key, or by right-clicking [Exit Extend] in the menu, or by "Cancel" in the command bar.