cuts on a sheet metal ellipse

Morning,

I've been working on a design tha requires some cuts on a sheet metal ellipse.  I managed to create a sheet metal ellipse by converting the ellipse into multiple arcs.  It can now be flattened and re-formed.  Unfortunately, when I flatten the part and add a cut along the top, it can no longer be reformed.  Any suggestions?

Thank you,

Steve

SolidworksSheet Metal