I would like to have an automated Excel formula that calculates the last 12 month and the previous time period 12 months. For example since we are now in July 2014, I want the June 2014-July 2013 period and in another cell the June 2013-July 2012 total. On the attached spreadsheet I have two products with their values and the columns of the months. Each product will need the current 12 months past and the last year 12 months.
Thanks.
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