nConstraint > Slide on Surface
Creates a Slide on Surface constraint from the selected nCloth, nParticle, or passive object components to a target surface (nCloth or passive object).
See Slide on Surface constraintand Creating an nCloth Slide on Surface constraint.
nConstraint > Slide on Surface > 
Opens the Create Slide on Surface Constraint Options Box window for the Slide on Surface operation. In this window, you can turn on Use Sets to add the selected nCloth or nParticle object components and target surface to a dynamic constraint selection set.