How do I add values to an existing drop-down list in RTC 6.02?

Need more context.  Let's presume it's for some attribute on a work item

1. Open the Project for change ( Web UI --> Choose Manage this Project from the settings menu ( sprocket )
2. Go down to the Work Items section on the left
3. Choose Enumerations from the sub list that appears under "Work Items" in the body of the page
4. Find the enumeration on the pulldown
5. Click the Add... to the right of where the enumeration values are then listed.  
   
6. Repeat (5) as needed
7. Save the project area.
   

1. Right click the project's label in the Team Artifacts or Team Organization view, choose Open
2. Click on the Project Configuration tab along the bottom of the new frame.
3. Expand Project section
   
4. Locate/expand the Work Items sub-section, then select Enumerations
5. At this point the behavior is roughly same as above.
6. Repeat (5) as needed
7. Save the project area

Okay instead of creating a new enumeration field, I reused the field from the other project and it works perfectly.  I am not sure what was different.  Both were of the same type - Environment Found In (Enumeration List)