This command adds points into a polyline. First you select the polyline to modify. The existing polyline vertices are marked and then you can pick or enter the coordinates for the new point(s). A new point is inserted into the polyline at the nearest polyline segment. On a 3D polyline, the elevation of the new vertex will be calculated for you. You can continue to pick points to add. Press Enter when you are done.
Select polyline to add to: pick a polyline
Pick or enter point to add: pick a point
Select polyline to add to: press Enter to end
Pulldown Menu Location: Edit > Polyline Utilities >
Edit Polyline
Keyboard Command: addpl
Prerequisite: A polyline