The Break command is used to delete a certain part of a selected 2D object (line,
circle, arc).
Draw a line.
Click Modify/Primitives/Break.
Click on the line.
Mark two points on the line. The line segment between these two points will be
deleted.
Mark two points on the line. The line segment between these two points will be
deleted.
Note:
If the selection in circle is made clockwise, the outer part is deleted.