Rebar marking type-3(with under line) 
 
  File name : B3.LSP

     Example 
Select objects:  {p1}~{p2} 5 found              [Select dot rebar or tie bar]
Select objects:                                [Finish selection]
Pick marking point: {p3}                        [Pick Position of mark]
Pick base line: {p4}                            [Pick side of under line]
Enter Marking: b                               [Nane of rebar]
Enter Rebar Dia: d32                   [Diameter of rebar]