You may want to group similar items in a Pivot Table. For example, you can group months into quarters.
Starting Point: You have created a Pivot table and are ready to group similar items.
Select similar items you want to group.
Right-click and select Group and Outline...Group.
Type the group name.
Repeat steps 1-3 until grouping is completed.
In the Pivot Table below the months have been grouped into quarters.