Today, I successfully managed to create rebaring of a column in FreeCAD. The process starts in the Sketcher workbench, where a user can add customised lines on the selected structural component which would include the desired rebaring.
After the modelling phase, I created the rebar drawings of the selected column too on A3 sheet.
At the end, I would like to conclude that the results are not much satisfactory. However, the freedom of modeling is great as usual. The sketcher phase needs to be developed more and automation of some unneccessary steps needs to be done.