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1. This is a great site!

My problem:

I have a monthly/quarterly report that comes out with a list of 50 different sites we use - I am grouping them into 4 groups to use in an array formula {=sum(if..(one of my 4 groups)} I would like to nest the OR formula in my SUM(IF) array - but at this point I'll be happy just to get the OR Formula straight to give an accurate TRUE or FALSE for each cell that occurs in my "D" Columnn range. The "M" column has the first list of site names, and the "D" column has the year to date list of site names. What did I do wrong with the OR_Formula? I know I can use up to 30 arguments...

=OR(D3=M\$2, M\$3, M\$4, M\$5, M\$6, M\$7, M\$8, M\$9, M\$10, M\$11,M\$12, M\$13,M\$14,M\$15,M\$16,M\$17,M\$18,M\$19,M\$20,M\$21,M\$22,M\$23,M\$24,M\$25)

2. If it's an array, why not just do sum(if(d3=m3:m25,1,0)) That will return true if any of the cells=d3.

3. Your question is not clear to me.

If you want to sum a column based on a table of sites, consider the Array Formula that follows.

Criteria is in C2
Names and areas in range rSites
Names in B
Amounts in E

=SUM(IF(LOOKUP(B2:B7,rSites)=C2,E2:E7))

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