You can use the Railing by Picking Points tool to create a horizontal railing anywhere in your model. You may, for example, want to create a railing around a stairwell, or insert a railing to separate two rooms in your house. You create the railing by picking the start point and end point of the railing. Each point you pick serves as a main post point.
To insert a railing along a floor:
Make sure the building location that you want to insert the railing on is current.
Select Insert > Railings > Railings by Picking Points, or click the Railings button on the Building toolbar and select Railings by Picking Points.
In the catalog, select the railing type you want to insert.
Select the start point for the railing.
Select an end point for the railing. You can continue adding sections to the railing if you want.
Right-click and select Finish.