I have an excelsheet with a month in each column. I would like to "lock" the cells when the month has passed, so the calculated values remain the same, if a constant is changed.
For example, my value for december 2019 is 286. if someone in january 2020 changes the numbers behind the calculation, I would like december 2019 to remain the same, but the months after that to change. I have tried some conditional formatting, but cannot find a place that locks the value.
This is my excel table:
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Excel Conditional calculation
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