Crystal Reports XI
  1. Open the Field Explorer (View > Field Explorer)
  2. Right-click on the parameter in the Parameter Fields section and select Edit
    Field Explorer
  3. Add/edit the parameter values in the "Value Field" list that appears in the middle of the window
    Edit Parameter Values
  4. Click OK
Crystal Reports 8.5:
  1. Open the Field Explorer (Insert > Field Object)
  2. Right-click on the parameter in the Parameter Fields section and select Edit
    Field Explorer
  3. Click Set Default Values
    Set Default Values
  4. Add new values in the "Select or enter value to add" box on the left or edit the existing values in the "Default Values" box on the right
    Edit parameter values
  5. Click OK