A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
In D304, use this formula:
=IF(C304="","",SUM(C$15:C304))
Then copy the formula down column D.
This will keep D blank whenever the corresponding C cell is blank. If C304 contains a value, D304 will calculate the cumulative sum from C15 through C304.
For example, if C304 is blank, D304 will be blank. If C304 contains 10, D304 will show the cumulative total including that 10.
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hth
Marcin