Adding year to date data based on selected month

What version of Excel are you using?

Try:

Formula:

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Copy across and down. You will need to change your month column headers to Text values, not dates.

Similar to TMS. Copied across and down. Also need to change the dates to month names in row 5.

=SUMPRODUCT(($B6:INDEX($6:$6,,MATCH($N$1,$5:$5,0)+COLUMNS($T9:T9)-1)=T$6)*$B9:INDEX(9:9,,MATCH($N$1,$5:$5,0)+COLUMNS($T9:T9)-1))

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Thanks.

If you have 365, here's an all-in-one spill solution:

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Glad to have helped.

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