From google translate:
PL-JOIN -Junction of selected polylines
PL-VFI -insert vertices in the selected polyline at the intersection with
by specified polylines, lines, arcs
PL-JOIN3D - Join 3D polylines
PL-A2L - Replace a line segment in a polyline with an arc segment.
PL-L2A - Replaces an arc segment in a polyline with a line segment.
PL-DIV -Divides the selected polyline segment into the specified number
segments or through a specified distance
PL-DIVAll -Divides all polyline segments by the specified number
segments or through a specified distance
PL-VxAdd -Adds a new vertex to the polyline
ENTREVS -Reverse Object
ENTREV - Reverse Objects (Multiple Choice)
PL-CW - Reverse selected polylines clockwise
PL-CCW-Reverse selected polylines counterclockwise
PL-VxRdc -Delete vertices of polylines that lie on one straight line
PL-VxDel -Delete selected vertex
pl-VxOpt -Remove coincident vertices from a polyline
PL-NoArc - Approximation of arc segments of polyline
PL-Clone -Construction of a polyline by copying its segments
PL-VxMove -Move polyline vertices (command line)
PL-Vx1 -Changing the beginning of the polyline (command line)
ConvTo2d - Convert line objects to 2D polylines
ConvTo3d - Convert line objects to 3D polylines
MPL - Building the center line
R3P - 3-point rectangle
PL-P90 -Drawing polyline segments perpendicular to each other
PL-CSE -Combine 2d polylines by primitive
PL-SgWidth -Change the width of the polyline segment