Hi,
A little difficult to tell without seeing an actual example workbook, so if this is not what you want can you upload one? Also there seems an inconsistency in your 2) statement which is implying both a calculation and also an absolute result of 8500.
However, assuming A1:L1 are the current year periods and I1 is the current period and J1:L1 are still empty.
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The only nuisance factor with this is that you need to change the I1 reference each new period. The way to avoid this is to hold the current period in another cell and use that to find the current period from a range of column period labels and build that into the formula so that it will work automatically for any current period. But you need to post an actual example to advise further.
Rgds
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