Stairs, Ramps, and Railings - Autodesk Revit Architecture 2015 Essentials - page 111

11. Press the Esc key twice, and select the split railing sketch path over
the landing.
12. On the Options Bar change the Slope to Flat.
13. Click Finish Edit Mode to exit the railing sketch.
14. Open the default 3D view, and notice that the railing condition is now
flat over the landing.
You can use the Slope controls for railing conditions when you need
to override how the default slope will be calculated. The completed
railing is shown in Figure 4.27.
FiGure 4.27 Completed railing