That's really poor spreadsheet design. How can you track daily entries?
If you MUST use such a structure, then the following code would do what you desire:
Whenever a cell value in the range C5:C8 changes, the new value is added onto the existing value in the corresponding cell in Column E.
Let me repeat, I strongly
recommend against this approach. it is poor design. You lose visibility (and potentially integrity) of your data.
It would be better deign to keep a source table of sales by executive by date in one master table, then compile a summary report from that table. Every day add new records to your data table. This would allow checking and changes to be made, and would allow greater flexibility in reporting.
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