ZBrushCentral

How to fill a closed curve with Sculpting or Smoothing etc?..&turn curve into Mask?

Hello ZBrushCentral, i hoped you might please show:

  1. how to (flood)fill a closed curve with Sculpting or Smoothing…?,
  2. how to convert a curve into a Mask?
    Some sculpting programs can apply sculpting along a curve but applying sculpts within closed curves would be great in ZBrush. But if its unable please suggest any capable software if known.
    Really appreciate any advise,
    J