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The Trim (Edit menu) command allows you to trim or break lines, arcs, continui and curves. Note that "trim" will extend an entity to the intersection point or truncate it back to that point as appropriate. The command offers the following options:
When trimming entities that lie in different CPLs the trimming will be in respect to the current CPL.
Entities other than lines and arcs are converted to B-splines when trimmed, e.g. trimming a continuous consisting of lines and arcs will convert the continuous into a b-spline (entity number will not change).
Curves can only be trimmed, not extended.
When breaking a curve it will be split into two separate curves. The curves will maintain their curvature compared to the original curve. When only one entity is selected to break a curve the curve is split into two and they will meet at the intersection point.