You can add, remove, or replace the components that are used in your nParticle constraint by editing constraint membership. You cannot, however, add an object to an existing constraint by editing constraint membership.
To edit nParticle constraint membership
The component members and links of the selected constraint highlight in the scene view.
For example, if you want to edit the membership of a Component to Component constraint that links vertices, switch to Vertex selection mode.
To use the nConstraint Membership Tool to edit dynamic constraint membership
-click the object or vertices you want to add to the selected dynamic constraint.
-click the object or vertices you want to remove from the selected dynamic constraint.
to complete the replace, add, or remove dynamic constraint members operation.
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