Loading Splines in editor

Seems I have to load the splines everytime I open the editor.

Do I need to transfer them to a specific folder for the editor to always remember the same ones ?

Usually, the editor "remembers" these spline types, which are included in your map. So if you load a new spline type and use it in your map, the editor will remember it. So I don't really see, why you have to load them everytime you open the editor...?