7. The method of claim 6, further comprising the steps of identifying each shape model referenced by the selected cell that is friendly with each other shape model referenced by the selected cell.
7. The method of claim 6, further comprising the steps of identifying each shape model referenced by the selected cell that is friendly with each other shape model referenced by the selected cell. 9. The method of claim 7, wherein the decomposition comprises the steps of: selecting a constituent model referenced by the second cell; determining whether a shape model referenced in the first cell maintains a rain relationship with the constituent model; and determining whether the constituent model is a shape model.