Split sheet metal part into multibody.

Can someone please tell me if the following is possible. If you look at the image or part I have attached you will notice it's a one piece part. I can flatten it and it's all one piece. However what I'd like to do is avoid having to draw in the top 45deg connection points and all that stuff with manual sketches. I can't bend this part because it's too deep. Is there anyway I can seperate the short side from the longer sides the way it is. Basically make a multibody part out of it.

SolidworksSheet Metal