Placing Railings on Curved Slopes

[ruzah1337]

Hello again, Revit newbie here. How may I place railings onto this curved slope? I can't use the Pick New Host > Pick Line tool as the curves I've highlighted in red can't even be selected. The lines in blue can be selected since they are just normal straight lines. 

For context, this is a very specific curve I made in Rhino and exported to Revit. I then made the floor sloped by changing the end slope's elevation via modifying sub elements and then made voids in the floor. In general, I'm facing problems trying to Pick Lines exported from Rhino to Revit. 

Thanks

[ToanDN]

Railing path cannot be a spline or even ellipse/partial ellipse.  You need to create the curve using compound arc segments.

[barthbradley]

What about importing Rhino into an In-Place Mass, Finish and Close out of In-Place Mass and apply a System Family Roof by Mass Face. You could host your Railing to that.