nConstraint > Disable Collision
Creates a Disable Collision constraint for the selected nCloth, nParticle, or passive objects, or components. See Disable Collision and Exclude Collision Pairs constraintsand Creating a Disable Collisions constraint.
nConstraint > Disable Collision > 
Opens the Create Disable Collision Constraint Options Box window for the Disable Collision operation. In this window, you can turn on Use Sets to add the selected nCloth, nParticle, or passive objects or components to a dynamic constraint selection set.