how to model this corner piece (beginner question)

 From:  Guille (GUILLE_ZOOM)
9879.1 
Hey everyone,

I'm pretty new to Moi3D and I'm just resorting to post in here because i can't find a workaround to model this piece. : (

I have modelled this suitcase and when modelling the corner piece (see attached pictures), I had to move to C4D (which I know much better) to do it as everything I tried on Moi didn't quite work.
In C4D i would just 'disconnect' those particular polygons and work from there but not sure about Moi?

thanks in advance!
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