tapered part- how to model

i am new to the sheet metal functionality.  i need to create a tapered sleeve.  for reference, my material is 23 ga sst.  the dims are 5" dia x 8" long.  i can model a straight part, but not a tapered part.  any suggestions?

fwiw, in the past, i have created similar parts by modeling with draft.  however, this project requires that i flatten the part

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