There's information here on clearing old items in a pivot table:

http://www.contextures.com/xlPivot04.html

kerncollies wrote:
I created a pivot table using a field named AR. Then, later, it was decided
to use a different group of data and I renamed the field to RM.
Unfortunately, when I open the drop down list, BOTH lists (AR name list and
RM name list) appear together instead of just the RM names. Is there any
easy way to "refresh" the list after a field name has been altered to get rid
of the old names?


--
Debra Dalgleish
Contextures
www.contextures.com/tiptech.html
Blog: http://blog.contextures.com