Individual points are created by entering each point in the usual way (see Point definition). The points can then be joined together to form lines.
Caution: It is impossible to create new points joining old ones.
The Number option lets you choose the label that will be assigned to the next point created. If a point with this number already exists, the old line changes its number. This option is used for example to automatize thinks in macros, knowing the identifier of the entitiy because it is forced.