You can nest more than 7 functions (like IF). But it won't work. In this
case, you should instead make a two-column table of your stuff, then use a
VLOOKUP in place of this IF-fest. Much more manageable.
In the example shown, all of your column numbers on row 20 are
incrementing by 15 each time.
You don't say how far your series extends, but I am assuming that the
interval remains at 15 as you continue onward.
This being the case, you can achieve a simple solution without If
statements using Sumproduct
=SUMPRODUCT((EE20:IV20)*(MOD(COLUMN(EE:IV),15)=0)*(INT(COLUMN(EE:IV)/15)<=D$14))
You can restrict the range back from column IV to the maximum that your
range extends to.
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