[Ataros]

Usually I start with someone else's mission loaded.

I select an object and open its properties (is it called object viewer?).

If I want to create new waypoint for selected object I ctrl-click or press INS key.

If I want to create a new different object I rightclick any place on map and chose deselect from menu. Then in property window that is still open I select object I want to create and ctrl-click on map to create it. If you ctrl-click again while this object is still selected it will create a new waypoint for it. You can edit a waypoint in a waypoint tab of this property/object window.