Is it possible to convert surface body into sheet metal?

Hello

 

I have a part, which is made based on surface which is thickend. . Unfortunately I am not able to find a solution to convert it into sheet metal. In this case I would br able to flatten it

Eventually I need a flat pattern

I do not have premium licens, but only professional. In premium ot is possible to convert surface into flatten.

The thickness of the part is constant