How to create a sheet metal on a surface in unigraphics?

I got an issue while working with sheet metal application. The problem is that i want to create a sheet metal part (A web & two flanges) on a surface. If i thicken the surface, i'm not able to bend the flanges. Can anyone help me with this? If possible please upload some sample ".prt" file or docs if any.

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I have attached a sample file with web and 2 flanges. first draw a surface you want, then thicken it and apply flange command.

 
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