this is assuming that you are useing columns ABCd
A and b being what you want to add, and c being the blank cell, d being where you enter the formula.
=if(c1="",sum(b1:a1),"")
By 'Add' I mean add to the data in each cell in column B by using a formula which puts the data in (in this case "b.") to all the cells in column B ONLY if there is an adjacent (to the right) blank cell in column C.
So there is no way of using a formula to put data (in this case the letter b.) into a cell which has numbers in it based upon the adjacent cells content?
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