Copy shape-driven rebar from a host to a similar one and preserve the manually selected constraints.
When you manually select a constraint target, that constraint is set as preferred and is maintained if you move the bar inside the host. Even if the constraint is outside the range of the bar, it is preserved as long as the bar segment remains parallel to it.
When you copy the bar from one host to a similar one, the constraints in the destination host will automatically match the selected (preferred) constraints from the original host.
Note: A structural host (1) is similar to another (2), if their corresponding faces are parallel and oriented the same way. Those corresponding faces are set as preferred for the copied rebar set (3) in the new host.