Flatten a curve

I am having issues with getting this to flatten? I am new to SolidWorks and have been using Flex to flatten part of the curve, but it won't let me flatten the remaining curve. In Sheet Metal it's not letting me flatten fully using that feature. Now I am lost. Can I anyone please help guide me in this process?

Thank you,

Heather

*****I have added the correct drawing now..

Message was edited by: Heather Miller

SolidworksDrawings And Detailing