Hi
Use INDIRECT function In DATA sheet
I suppose that with array function is better than a single formula but you can try with your data
I'm also assuming line 1 of Sheet A, B, C, ... has no values and the maximum number of rows are 10000
Normal formula
In DATA!A2 use
=INDIRECT($A$1&"!"&"A2")
and drag to I10000
Array formula
Select A2:I10000, insert the following formula and confirm by pressing CTRL+SHIFT+ENTER to activate the array, not just ENTER. You will know the array is active when you see curly braces { } appear around your formula. If you do not CTRL+SHIFT+ENTER you will get an error or a clearly incorrect answer.
See the file with array formula implemented
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