Can I create a Pivot Table using a combination of two rows as the header?

Example:

Row B1 = May_05
Row B2 = June_05

A3 thru A10 = Dates

B3 thru B10 = Values

I want to establish B1 & B2 together is the header row. I need to do this because C1 = May_05, C2 = Aug_05. My header is a pair of months.

Does anyone know if this is possible?

Thank You,
Steve