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Message: [QUOTE="mwavra, post: 3788646"] I'm not even sure if this is possible, but I've thought about it a while, cruised through a lot of the posts, and thought I'd go to the experts and see if they can help. Part No Leadtime Monday Tuesday Wednesday Thursday Friday 11154001 5 2000 2530 2020 1860 2640 11154002 4 3200 2530 2020 1860 2640 11154003 3 5000 2530 2020 1860 2640 11154004 2 1700 2530 2020 1860 2640 11154005 1 2250 2530 2020 1860 2640 The columns go out for 4 weeks - Monday thru Friday. Based on the lead time, I need to find the highest demand within the 4-week time frame. So, if the lead time is 5, I need to add Monday thru Friday, Tuesday thru Monday, Wednesday thru Tuesday, etc., and find the highest total demand for that item. If I change the lead time from a 5, to a 4, it would need to recalculate and give the highest demand over a 4-day period. Can anyone help? [/QUOTE]