Hey all, If I have a part that i started as a normal boss extrude can I change that feature to a base flange?

I created a part as a machined piece and now they want to see it as a sheet metal piece, I thought I could just make a configuration of the same part but i can't add an edge flange to it?

Pretty new at this so not sure if it's even possible.

TIA

Mark S

SW2010 sp4.0