If row 1 has TEXT values Jan-Dec in A1-L1, then Jan-Dec again in
M1-X1...
...and values below in row 2 for each month noted above.

For now, place a text entry like Mar in A4.

Now this INDIRECT formula will compare the two ranges based on the text
entry "Mar"

=SUM(INDIRECT("A2:"&CHOOSE(B4,"A","B","C","D","E", "F",
"G","H","I","J","K","L")&"2"))-SUM(INDIRECT("M2:"&CHOOSE(B4,
"M","N","O","P","Q","R","S","T","U","V","W","X")&" 2"))

Be sure to copy that as a single row, not the 3 rows the forum will
make it into.


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JBeaucaire
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