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I created an extrusion, going on extrusion and setting two reference planes. I assigned the dimensions, which parameterize: Length : 4000 cm Width : 200 cm I gave 250 cm of thickness to this object. 

I created the buttonholes for the screws. 

Then, I did, extrusion > circle. From properties > solid > void I could create an object that can pierce the previous one.

With the cut command, I select the two objects and create a void.

Now I create the "mother" part that will support the "child" object, starting from metric generic model.

Composizione tettonica libera di elementi sagomati preforati giuntati con connessioni puntuali e nodi d'angolo opportunamente disposti. 

La suggestione compositiva parte dallo stimolo del concetto di adesione per superfici della famiglia "generic model face based”.

In a family type  "Generic Model" named "child", I created references planes and a new extrusion. 
The parameters of the length have to be "shared parameters" and the type "instance".
I opened a second "generic model" called, this time, "mother" and I created a new extrusion. 
After, I inserted the file "child" in the mother file and I created a composition with this 2 elements.
Finally, in a new "project" I assembled them to create a bigger composition more complex.