Merging and creating new shapes in PCell

Hello,

I've tried to research as much as I could but I have a PCell which creates certain ROD shapes.  Once all of those shapes are created, I wanted to merge them to create one new single ROD object which I could then use as the basis to create additional shapes with different sizing on different layers.  I can get the shapes to merge using leMergeShapes(pcCellView~>shapes) but that just returns the list of merged shapes.  How can I use this to create a new ROD object which I can then use with rodCreatePolygon() and using the ?fromObj setting?  

Thanks,

Miguel