Specify the column or expression whose values determine the categories. In the Graph Data page in the Graph dialog box and on the Data page in the Properties view, you can select a column name from a drop-down list.
There is an entry along the Category axis for each different value of the column or expression you specify.
Using display values of data If you are graphing columns that use code tables, when data is stored with a data value but displayed to users with more meaningful display values, by default the graph uses the column’s data values. To have the graph use a column's display values, use the LookupDisplay InfoMaker expression function when specifying Category or Series. LookupDisplay returns a string that matches the display value for a column:
LookupDisplay ( column )
For more about code tables, see “Defining a code table”. For more about LookupDisplay, see LookUpDisplay.