@Einar_Raknes Your solution works perfectly. I get a list of Rebar Items in the selected host.
I'm now having trouble copying them to another concrete beam. Copy.Translate doesn't seem to work on rebar items.
I've seen posts about copying walls where people wrote that copying families isn't possible. I can't imagine this can't be done.
I think I'm looking for a way to copy these rebars in a direction + distance. Direction and distance are then defined by the line between the two host (one with and on without rebar)