constraining a cluster to a vertex ????
 

I have a curve with 5 clusters attached, and these clusters I wanna contraint to 5 vertices, one per cluster, on a polysurface which should result in my curve deforming as the poly surface deforms.
But I dont remember how to constraint an object to a single vertex, anyone help please ?

You may want to make your vertices clusters as well and constrain the curve clusters to the surface clusters.