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.
Shortcut: m
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Click
.
- 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)
See the Learning center course Introduction to Sketching (Onshape account required) for more information.