Hi
This is an example.
I defined
Name: worksheets
Refers to: Sheet1!$E$1:$E$10
As you can see only 2 cells have names of worksheets (E2 and E8), the others are empty.
The formula sums the column I in the worksheets Sheet4 and Sheet7 where the value in column B is "a" (the value you get from Sheet1!B4)
I used the formula I posted in Sheet1!B1 and got the result 102, as expected.
[TABLE="width: 2"]
<tbody>[TR]
[TH] [/TH]
[TH="align: center"]A[/TH]
[TH="width: 30, align: center"]B[/TH]
[TH="width: 30, align: center"]C[/TH]
[TH="width: 30, align: center"]D[/TH]
[TH="align: center"]E[/TH]
[TH="width: 30, align: center"]F[/TH]
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<tbody>
[TD]
[TD="align: center"]
1
[/TD]
[TD="align: left"]Result[/TD]
[TD="align: right"]102[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: center"]
2
[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: left"]Sheet4[/TD]
[TD="align: right"] [/TD]
[TD="align: center"]
3
[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: center"]
4
[/TD]
[TD="align: right"] [/TD]
[TD="align: left"]a[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: center"]
5
[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: center"]
6
[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: center"]
7
[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: center"]
8
[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: left"]Sheet7[/TD]
[TD="align: right"] [/TD]
[TD="align: center"]
9
[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: center"]
10
[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="colspan: 7"] [Book1]Sheet1[/TD]
</tbody>
[/TD]
[TD][TABLE="width: 2"]
<tbody>[TR]
[TH] [/TH]
[TH="width: 30, align: center"]A[/TH]
[TH="width: 30, align: center"]B[/TH]
[TH="width: 30, align: center"]C[/TH]
[TH="width: 30, align: center"]H[/TH]
[TH="width: 30, align: center"]I[/TH]
[TH="width: 30, align: center"]J[/TH]
[/TR]
[TR]
[TD="align: center"]
1[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
2[/TD]
[TD="align: right"] [/TD]
[TD="align: left"]a[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"]1[/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
3[/TD]
[TD="align: right"] [/TD]
[TD="align: left"]b[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"]2[/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
4[/TD]
[TD="align: right"] [/TD]
[TD="align: left"]c[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"]3[/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
5[/TD]
[TD="align: right"] [/TD]
[TD="align: left"]a[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"]4[/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
6[/TD]
[TD="align: right"] [/TD]
[TD="align: left"]b[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"]5[/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
7[/TD]
[TD="align: right"] [/TD]
[TD="align: left"]c[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"]6[/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
8[/TD]
[TD="align: right"] [/TD]
[TD="align: left"]a[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"]7[/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
9[/TD]
[TD="align: right"] [/TD]
[TD="align: left"]b[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"]8[/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
10[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="colspan: 11"] [Book1]Sheet4[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[TD][TABLE="width: 2"]
<tbody>[TR]
[TH] [/TH]
[TH="width: 30, align: center"]A[/TH]
[TH="width: 30, align: center"]B[/TH]
[TH="width: 30, align: center"]C[/TH]
[TH="width: 30, align: center"]H[/TH]
[TH="width: 30, align: center"]I[/TH]
[TH="width: 30, align: center"]J[/TH]
[/TR]
[TR]
[TD="align: center"]
1[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
2[/TD]
[TD="align: right"] [/TD]
[TD="align: left"]a[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"]10[/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
3[/TD]
[TD="align: right"] [/TD]
[TD="align: left"]b[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"]20[/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
4[/TD]
[TD="align: right"] [/TD]
[TD="align: left"]a[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"]30[/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
5[/TD]
[TD="align: right"] [/TD]
[TD="align: left"]b[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"]40[/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
6[/TD]
[TD="align: right"] [/TD]
[TD="align: left"]a[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"]50[/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
7[/TD]
[TD="align: right"] [/TD]
[TD="align: left"]b[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"]60[/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
8[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
9[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="align: center"]
10[/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[TD="align: right"] [/TD]
[/TR]
[TR]
[TD="colspan: 11"] [Book1]Sheet7[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[/TR]
</tbody>[/TABLE]