In a data table, the data can be sorted by Var A in ascending order, then Var B in descending order. This function is not applicable to Cross-table, though one would expect the concept is similar.
The reason is because, sometimes after sorting by Var A, there are several rows with the same value, hence it would be helpful if within these rows of values which are the same for Var A, we can further sort them by a Var B for better analysis.
please