Essentially, you want to show the last 13 months of data. Adapt the ideas at
Dynamic Charts
http://www.tushar-mehta.com/excel/ne...rts/index.html
particularly example 2
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"dave157" wrote:

I am preparing a template that will be used by many of our sites to prepare a
monthly Cost of Poor Quality chart. This is a stacked bar chart that depicts
the current months data plus the previous 12 months of data. Data is added
every month and I want the charts X-axis will roll every month to display
the current month plus the past 12 months. Any ideas how to accomplish this?