Sorting is the process of ordering your data rows by a certain sequence. For each available data category, you can choose which data field should be used to sort the rows. Fields can be sorted in ascending or descending direction. The way in which rows are sorted depends on the type of value in the field:
Numeric
Asc Lower values Higher values Desc 
Date
Asc Past Future Desc
Text
Asc A Z Desc
Sorting Employees by the Department field, ascending
A report can have multiple sorts. This can be useful when you want your highest precedence sort to affect a data field where the values for multiple rows may be the same.
For example, imagine a large company with many employees. There could be multiple people with the last name Buchanan. With only a sort on LastName, you do not know how all the people with the last name Buchanan will be ordered amongst themselves. If this matters, then you can add a second sort on, say, the FirstName field, so that people with the same last names will be ordered by their first names.
Adding sorts
On the Sorts page, add data fields to sort. The precedence of the sorts starts with the highest row and moves down the list. Drag the rows up or down to change the precedence.
Dragging a field to the Sort By pane
Tip: Sorts are not applicable for Crosstab Reports.