Additional Editing Options for Polylines

In addition to the general editing operations available for most objects, there are additional options available for editing and joining polylines with PEDIT.
Close. Creates the closing segment of the polyline, connecting the last segment with the first. AutoCAD considers the polyline open unless you close it using the Close option.
Join. Adds lines, arcs, or polylines to the end of an open polyline and removes the curve fitting from a curve-fit polyline. For an object to join the polyline, their endpoints must touch.
Width. Specifies a new uniform width for the entire polyline. Use the Width option of the Edit Vertex option to change the starting and ending widths of segments.
Edit Vertex. Marks the first vertex of the polyline by drawing an X on the screen. If you have specified a tangent direction for this vertex, an arrow is also drawn in that direction.
Fit. Creates a smooth curve consisting of arcs joining each pair of vertices. The curve passes through all vertices of the polyline and uses any tangent direction you specify.
Spline. Uses the vertices of the selected polyline as the control points, or frame, of a spline-fit polyline. The curve passes through the first and last control points unless the original polyline was closed.
Decurve. Removes extra vertices inserted by an arc-fit or spline-fit polyline and straightens all segments of the polyline.
Ltype Gen. Generates the linetype in a continuous pattern through the vertices of the polyline. When this option is turned off, AutoCAD generates the linetype starting and ending with a dash at each vertex.
Modify MultilinesA multiline object consists of several parallel lines. Additional editing opeartions are available to change the vertices, intersections, and other properties of the line elements.
You can edit a multiline by adding and deleting vertices and controlling the display of corner joints. You can make multilines intersect in various ways. You can also edit multiline styles to change the properties of individual line elements or the end caps and background fill of future multilines.