Sheetmetal rolling without fixed flat surface or a line parallel to centre of radius.

Hi, I am trying to roll a piece of sheet metal as shown in pictures below.

Solidworks just won't allow me to convert this to a sheet metal.

I have also tried base flange with the basic shape, unfold part, do the cutting. It just won't allow me to fold the part back! I am assuming the fix face to select for fold needs to be parallel with the bendline. (Not sure if I have described this properly). Neither would sketch bend with a big radius work.

Any workaround?

Regards

Kent

SolidworksSheet Metal