Trim
Available in: Sketch
Trim a curve to the first intersecting point or bounding geometry. If no intersection or bounding geometry is found, then the entire curve is deleted.
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This video shows you how to use the trim tool. You can trim a curve to the first intersecting point or bounding geometry. If no intersecting or bounding geometry is found, then the entire curve is deleted. In this example we have two rectangles, but we want to create a single shape out of both of those rectangles, so select the trim tool from the toolbar, and then click on the entities that you want to delete. You now have a new shape. You can also create a line that intersects the shape where you'd like, so that you can trim different areas of the shape away. Select the trim tool, and you can now trim the different entities to create your custom shape.
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Click
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- Click entities to trim away.

You can also click and drag through multiple entities to trim them:
You can also delete any standalone sketch points:
Trimming a Bezier curve results in the trimmed portion being removed, with the remaining section of the curve retaining the original number of degrees and control points:
Original curve (left), Trimming at the construction line (middle), result of the trim (right)