I have a list of data that I download every week. Product code in col A,
product starting date in col B (this is not a calendar date, it's a week
number: term1 week 1, t1w2, etc) So col B actually will have the terms from 1
to 13. Col C will have the weeks (1-4). Col D will have the sales values. I
need to sum the sales for 13 terms or 52 weeks. Each product has a different
starting date. Once the sales for the 52 weeks get summed, start summing the
next 52 weeks/13 terms.
How can I do that dynamically?

Thanks.
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when u change the way u look @ things, the things u look at change.