i've already done that but the swc file doesnt appear in the library with my movieclips inside it.
It will not appear in your library.
You need to access them through code, for e.g.
you have a movieclip exported within SWC with an identifier name "Clip"
so after linking the SWC, write this:
var clip:Clip = new Clip();
Ah ok ! this is what I thought... so there's no way to use it as a kind of "shared library"
Ok, thanks for your help !