Duplicate a curve with clusters
 

I have a curve that I created. After I created the curve I was able to add clusters to it using Select>Cluster Curve, which works fine, but I want to duplicate the curve and clusters and have it still work. When I duplicate the curve and clusters, the curve and clusters are duplicated as expected, however the Clusters in the duplicate no longer work. Is there a way to duplicate the curve with it's clusters and maintain those relations so it works the same as the original curve?