I have a spread that is used for labor tracking. Assume every cell represents a day. I want to be able to specify a percentage of labor completed against the plan, every month. So, if there were 80 hours available and someone worked 8 hours a day. The planned hours would be consumed after 10 days. I want to use conditional formatting to change the color of the appropriate cells based on a percentage, i.e., if the percentage is 80%, then every every cell >= 64 hours, i.e. ,days 8, 9, and 10 should have the conditional formatting rule apply. I don't know how to write a formula that will calculate the sum of cell1 against the value of cell 1, then the sum of (cell1 + cell2) against the value of cell 2, the sum of (cell1 + cell2 + cell3) against the value of cell3. In the image that I have uploaded, I would like to set his formula for the range BS17 to CW17. I apologize that I cannot upload a snippet using the XLBB add-in at the moment. I am getting an error message that it cannot run/is not allowed in protected mode.