You can trim sketch entities, including infinite lines, and extend sketch entities (lines, centerlines, and arcs) to meet other entities.
Trim Entities 
includes options:
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Power trim
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Trim multiple adjacent sketch entities by dragging the pointer across the entities, or extend entities by selecting them and dragging the pointer.
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Corner
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Trim or extend two sketch entities until they intersect at a virtual corner.
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Trim away inside
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Trim open sketch entities inside two bounding entities.
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Trim away outside
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Trim open sketch entities outside two bounding entities.
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Trim to closest
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Trim or extend sketch entities to the closest intersection.
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