flattening parabolic or elliptical sheetmetal

I have a many sheet metal parts that are parabolic and elliptical and
i need to flatten them for nesting and cutting purposes. can this be
done and if so, how? i've looked at the help file, but no luck, so i
thought i'd ask the brain trust. thanks

 

Single curved surfaces or double curved?

 

haven't used that, but will give it a shot...

 

single... the parts i make that are ellipitical or parabolic are
usually for reflectors or antenna style sheetmetal, so that's why i
need them flattened... especially if i need to hem edges, etc. etc...

 

Rectify the curve.

 

how do i do that?