Spline toolnot available in Stairs

[glkirk]

Hello,

I need to draw a set of somewhat circular stairs but they are not a true radius.

What I would like to use is the spline tool but it is not available in stairs.

I tried drawing my lines with thin lines, hoping to be able to pick them. No go.

Does anyone have any thoughts here?

Thanks!

[barthbradley]

Maybe a Repeater?  

Treads along Mass Spline Edge/Divided Line.

[ToanDN]

You can draw a detail spline then sketch the stair using arc segments closely match the spline.