solid creation from "copy geometry"

[silvia leoni]

good evening, in order to create a padding for an armchair, I should create a solid by copying geometry, as the surface must match perfectly for assembly. I tried to copy the geometry and make "often, only that I would need to eliminate the back surface of the padding (the one in contact with the armchair).. but it doesn't make me do it because the extrusion "is not forward but behind".
so I tried to redesign geometry through the profile, only that the relationship between the new sketch and copied geometry was created. I can't get rid of addiction, can anyone help me please?? ? ?

 

[silvia leoni]

I managed to drive, but I can't create a sketch on the green surface

 

[folle76]

I'm sorry you get these projects done without proper software knowledge. It doesn't make you the sketch because it's not a plan that surface (it's probably that one).

 

[silvia leoni]

sorry also to me ahahaha has shaped such a detailed armchair whose purpose is to be ready for industrialization, with a program explained in 4 lessons... definitely not the maximum! especially if it is the last examination. .

Anyway, despite the fact that she managed to sgusciare (I don't know how) the back... I could not create sketches, as the reference floor is not adherent to the surface of the armchair. ? I think it is advanced features that have not been explained