Sloping half wall

[dbritti]

Can someone tell me how to create an interior dividing wall that starts at ceiling height but slopes (curves like a ramp) down to a half wall?  I can create a wall with a straight slope using a wedge shape sitting on top of a half wall but I want there to be a curve to the slope.  See image below.  THanks for any help!!  I'm using Home Designer Interiors 2016 on a mac laptop.