Pivot Table Subtotals

I have a pivot table with two Row Fields. The first row field has automatic subtotals enabled. However, about half of the data only have one piece of data for the second row field, the other half of the data has multiple data. The problem is that I do not want to show subtotals for those items that consist of only one row, but I do want subtotals for those that have multiple rows.

RF1 RF2
A 1
A 2
B 1
C 1
E 1
E 2
E 3

Using the above data as a simple example I want there to be subtotals for "A" and "E" only. Please note that the Data -> Subtotal is not useful because I also have a few Column Fields and two Page fields.

Any help is appreciated.

Thanks,
Mark