1) There needs to be a complete list of answers in column A, list the sales manager for each row, keep it simple. Do you really even need this column? Something to think about.
2) In the totals row, you should use the SUBTOTAL() formula instead of SUM(). SUBTOTAL() will adjust its own answers in relation to how many rows are visible in a filtered list.
3) In the totals row, there needs to be at least one cell that is empty so we can look UP through that column to see how many rows of data are visible not counting the totals row. I've left column B cell empty so we can also get a clean list of values in column B for the sheet names, moving the TOTAL cell eliminates the need to exclude the word "Total" from our sheetname list.
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