Forum Post: report that sums units sold by sku

I am trying to create a report either in crystal or explore that will give back the number of units sold per sku within a specific date range.  Anything I create in explore will give details and a summary line but this is too much detail (and rows).  I also have a report in Crystal that give me my allocated units, re-order points. Ideally  I would love just to add one more column to this report to reflect the sum of units sold within 18 months, but none of my fx seem to work properly.   Any suggestions?   Thanks,