To Define Variable Properties

From the menus choose:
Data > Define Variable Properties...
Select the numeric or string variables for which you want to create value labels or define or change other variable properties, such as missing values or descriptive variable labels.
Specify the number of cases to scan to generate the list of unique values. This is particularly useful for data files with a large number of cases for which a scan of the complete data file might take a significant amount of time.
Specify an upper limit for the number of unique values to display. This is primarily useful to prevent listing hundreds, thousands, or even millions of values for scale (continuous interval, ratio) variables.
Click Continue to open the main Define Variable Properties dialog box.
Select a variable for which you want to create value labels or define or change other variable properties.
Enter the label text for any unlabeled values that are displayed in the Value Label grid.
If there are values for which you want to create value labels but those values are not displayed, you can enter values in the Value column below the last scanned value.
Repeat this process for each listed variable for which you want to create value labels.
Click OK to apply the value labels and other variable properties.

Optionally, you can:

Automatically determine an appropriate measurement level for a variable.
Assign variable roles.
Copy value labels and other attributes from another variable to the selected variable.
Copy value labels and other attributes from the selected variable to multiple other variables.
Auto-label values that don't have value labels, using the data value as the label.
Designate categories as containing missing values.
Change the variable label and/or display format.