Drives the geometry of a part in an assembly from a part family

Hello 

So there you have it, I have already asked the question but I did not fully understand the answers I was given, I would like to provide, from a family of parts in the assembly, to control the square mouth. That is to say, to be able to modify the length, the height, as well as the distance between the mouth and one of the ends of the screw (via a plane for example).

The problem being that I don't know at all how to be able to change this data from a part family, I was told to create configurations before creating the part family but I didn't understand how to do it at all.

I'm on SW 2018.


essaie.zip

I found how to control the distance of my plane, but I still can't find how to add the value of the square mouth extrusion in the part family of the assembly