Elbow Gores Tool
The Elbow Gores Tool is now a kind of the Segmented Bend Tool: choose All gores laid out as its Kind. Its trade's drawings (HVAC, sheet metal) start with it, and the Tool menu still lists it by its own name.
See Elbow Gores Tool for how to use it.
In 3D
A 3D page shows each gore rolled into its piece of duct and the gores put together into the elbow (Wrapping and sweeping).