Abstract: Method for assigning an assortment of products to an existing planogram includes: providing an existing planogram which includes an existing assortment of products in association with a geometrical placement layout of these products on shelves and storing the existing planogram in memory; providing a user-defined new assortment of products and storing the new assortment in memory; furnishing, by a processor having read/write access to the memory, an output planogram by removing, from the output planogram, products in the existing assortment but not in the new assortment and adding, to the output planogram, products in the new assortment but not in the existing assortment; storing the output planogram in memory. The method further includes: generating a set of at least one segmentation tree which describes the relative geometrical placement of products in the existing planogram according to several ordered category types, each type corresponding to a level of the segmentation tree.