Divide cell values over specified # of quarters starting a specified quarter

I'd like to automatically divide the amount in a column over # of quarters (a parameter in column O) starting the quarter specified in column B without macro.

Note, the text specifying the quarters in column B matches the column headers in columns C through M.

Screenshot is provided below and the excel file is attached. Currently I have just divided by 4 manually to show as an example.



I'd appreciate any help you can provide. Thanks, Nick.

Hi and welcome
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Apologies, will keep this in mind for the future post. I got a solution from ExcelForm.com. Thanks so much! Appreciate the help.