A cell list block allows you leverage a pre-existing cell list file in an audience. A cell list allows you to divide a series of input records into discrete cells, based on a number of supplied dimensions. For more information, please see the Cell List Designer documentation.
Like a split, a cell list block is also used to split an audience into a series of discrete outputs. The rules that define how the split is to be effected are contained in a cell list. A cell list block is configured with a cell list, allowing the rules defined therein to be applied in the context of an audience. If required, a cell list can be used to configure multiple cell list blocks across several audiences.