Thanks Barry for the reply !
So surface schedule vs components schedule :
In my case, component schedule will list the niches skins correctly if they are seperated, and each skin have it's own reference line, this will show me 2 outputs in the schedule : 1-the thickness of the skin, 2-the surface of the skin
Surface schedule will list all surfaces, even horizontal ones, without splitting fills, but it won't list the skin thickness wich i need to schedule too,
that's the points,
surface schedule is ised for almost painting works, panting surface,
component schedule is more powerfull for skins schedueling
i'm using them theese days intensely and they do the job very well