You can design a rebar layer from a curve by selecting Wire
selection. The Wire selection creation mode allows you
to design a rebar an existing curve or from scratch by creating a curve either in the Sketcherapp or in the Concrete Structures 3D Designapp.
Before you begin:
Create a concrete part with a rebar object to help you organize your concrete structure.
Create the rebar features inside a geometrical set under a 3D shape.
Define the working context on the created geometrical set that will accommodate the rebar features.