SegmentΒΆ
New Segment tool
New Segment
To create a new segment, with 
clicked, select in the map, firstly, the point where you want that segment starts, then, to finish the track click first the left button and then the right button. You can concatenate two or more segments clicking the left button, as you can see in the pictures:
Concatenated Segments
To delete a segment you have to remove one of the waypoints of its extremes. You can move the concatenated segments moving the waypoint between them.
Warning
When you create a segment, you have to be careful with the altitud of the waypoints of its extreme, if some of them are under the altitud indicated by the meshes, the segment will be represented in red. To resolve this, you can change the altitud of the waypoints clicking twice over them.
Segment under the Ground