If you are talking about smoothing a curved face, a Stanley 113 type plane may be the trick.
If you need to make mouldings, beads, etc, consider coachmaker or carriagemaker tools. Also, there is something called a sweep, which is a basically a scratch stock that uses a rod as an edge guide. A bead could be made simply by using a running the edge of a screw head into the wood. The screw is screwed into an edge guide. . Other times, you just need to carve it out.
Check out Peter Follansbee’s site: