Hi,

I don't understand that I have to built the axes xx, yy, zz every time I create a part.

Is it so complicate to have them as soon as I get the empty part ?

And I don't understand that I have to :

unfix the first part I insert in an assembly, and to create a first constraint to have Origin of the part = origin of the assembly and axles aligned,

because this first part lands at random  place.

This kind of detail makes SW really very uncomfortable, and gives the impression of a labyrinthine system which was plastered n times (but perhaps it is) ....